diff --git a/bin/omarchy-upgrade-to-quattro b/bin/omarchy-upgrade-to-quattro
index b431ef34..00083d33 100755
--- a/bin/omarchy-upgrade-to-quattro
+++ b/bin/omarchy-upgrade-to-quattro
@@ -1432,6 +1432,7 @@ retire	systemd/user/bt-agent.service	0406b577a1225dc2a9f86638d3c346eb3635168576f
 retire	systemd/user/omarchy-recover-internal-monitor.service	b9b92cedc44cf3cb6216948629be55b53d16746e31896dc6469fd49ba55e82f4
 retire	systemd/user/omarchy-recover-internal-monitor.service	e1483079b9f2aefcd43b4722c75a31643e5f3bb5a2eada5f52f1d7d201e8c289
 retire	systemd/user/omarchy-sleep-lock.service	6870b232a6c0474b59187882e6d25ae771bba735098bcbedef8a2b73b97e2b6a
+retire	systemd/user/omarchy-sleep-lock.service	bcd1a76cb5c63514922bc5e11af22ae480fc6d06a99863364e02bdf3c7bdceaf
 retire	uwsm/default	2e89b03a3710b70cf754ea0c8db4388bb35a7519870036abff5ea8a584eafbc0
 retire	uwsm/default	3622ba134d29b639a155424a5226215e213c8508144e98001ffe128a8967c9b5
 retire	uwsm/default	73712c5a677532bd4afcee5800ae9b76e3d02a2130659a96a8b7fbe2fd2c3d53
diff --git a/default/systemd/user/omarchy-sleep-lock.service b/default/systemd/user/omarchy-sleep-lock.service
index 8bf696fe..72b17426 100644
--- a/default/systemd/user/omarchy-sleep-lock.service
+++ b/default/systemd/user/omarchy-sleep-lock.service
@@ -1,7 +1,13 @@
 [Unit]
 Description=Lock Omarchy before suspend
-After=dbus.socket
+# The monitor calls into the running Omarchy shell. Wait until UWSM has imported
+# OMARCHY_PATH and WAYLAND_DISPLAY, but keep the default target ordering so the
+# monitor starts before graphical-session.target is reached.
+After=dbus.socket wayland-session-waitenv.service
 Requires=dbus.socket
+PartOf=graphical-session.target
+ConditionEnvironment=OMARCHY_PATH
+ConditionEnvironment=WAYLAND_DISPLAY
 
 [Service]
 Type=simple
diff --git a/migrations/1785608166.sh b/migrations/1785608166.sh
new file mode 100644
index 00000000..cdfc6e61
--- /dev/null
+++ b/migrations/1785608166.sh
@@ -0,0 +1,79 @@
+echo "Repair the pre-suspend lock monitor's graphical session environment"
+
+# The old unit started before UWSM finished importing OMARCHY_PATH and
+# WAYLAND_DISPLAY. A full unit retained from before Omarchy 4 also shadows the
+# corrected package unit, so add the lifecycle constraints as a drop-in without
+# discarding any user customizations.
+user_config_home="${XDG_CONFIG_HOME:-$HOME/.config}"
+sleep_lock_unit="$user_config_home/systemd/user/omarchy-sleep-lock.service"
+sleep_lock_dropin_dir="$user_config_home/systemd/user/omarchy-sleep-lock.service.d"
+sleep_lock_dropin="$sleep_lock_dropin_dir/90-omarchy-session-environment.conf"
+
+if [[ -f $sleep_lock_unit ]]; then
+  mkdir -p "$sleep_lock_dropin_dir"
+  printf '%s\n' \
+    '[Unit]' \
+    'After=dbus.socket wayland-session-waitenv.service' \
+    'Requires=dbus.socket' \
+    'PartOf=graphical-session.target' \
+    'ConditionEnvironment=OMARCHY_PATH' \
+    'ConditionEnvironment=WAYLAND_DISPLAY' >"$sleep_lock_dropin"
+fi
+
+# With no live user manager there cannot be an inherited monitor to replace.
+# The package unit (and compatibility drop-in, when needed) will be loaded by
+# the fresh manager at the next login.
+user_manager_socket="${XDG_RUNTIME_DIR:-/run/user/$UID}/systemd/private"
+if ! error=$(systemctl --user show-environment 2>&1); then
+  if [[ -S $user_manager_socket ]]; then
+    echo "Could not reach the running user service manager: $error"
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  fi
+  exit 0
+fi
+
+if ! error=$(systemctl --user daemon-reload 2>&1); then
+  echo "Could not reload the user service manager: $error"
+  echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+  exit 1
+fi
+
+if ! graphical_state=$(systemctl --user show --property=ActiveState --value graphical-session.target 2>&1); then
+  echo "Could not inspect graphical-session.target: $graphical_state"
+  echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+  exit 1
+fi
+
+if [[ $graphical_state == "active" ]]; then
+  if ! error=$(systemctl --user reset-failed omarchy-sleep-lock.service 2>&1); then
+    echo "Could not reset omarchy-sleep-lock.service: $error"
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  elif ! error=$(systemctl --user restart omarchy-sleep-lock.service 2>&1); then
+    echo "Could not restart omarchy-sleep-lock.service: $error"
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  elif ! sleep_lock_state=$(systemctl --user show --property=ActiveState --value omarchy-sleep-lock.service 2>&1); then
+    echo "Could not inspect omarchy-sleep-lock.service: $sleep_lock_state"
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  elif [[ $sleep_lock_state != "active" ]]; then
+    echo "omarchy-sleep-lock.service did not stay active after restart."
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  fi
+else
+  # A pre-fix monitor was not tied to graphical-session.target and can outlive
+  # logout under a lingering user manager. Stop it so the next target start
+  # creates a process with the next graphical session's environment.
+  if ! error=$(systemctl --user stop omarchy-sleep-lock.service 2>&1); then
+    echo "Could not stop stale omarchy-sleep-lock.service: $error"
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  elif ! error=$(systemctl --user reset-failed omarchy-sleep-lock.service 2>&1); then
+    echo "Could not reset omarchy-sleep-lock.service: $error"
+    echo "The pre-suspend lock repair will be retried by omarchy-migrate."
+    exit 1
+  fi
+fi
diff --git a/test/shell.d/sleep-lock-environment-migration-test.sh b/test/shell.d/sleep-lock-environment-migration-test.sh
new file mode 100755
index 00000000..e778c1c0
--- /dev/null
+++ b/test/shell.d/sleep-lock-environment-migration-test.sh
@@ -0,0 +1,162 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+stub_bin="$test_tmp/bin"
+mkdir -p "$stub_bin"
+
+cat >"$stub_bin/systemctl" <<'STUB'
+#!/bin/bash
+
+printf '%s\n' "$*" >>"$SYSTEMCTL_CALLS"
+
+case "$*" in
+  '--user show-environment')
+    [[ ${MANAGER_AVAILABLE:-true} == "true" ]]
+    ;;
+  '--user daemon-reload')
+    if [[ ${FAIL_SYSTEMCTL_ACTION:-} == "daemon-reload" ]]; then
+      echo "reload failed" >&2
+      exit 1
+    fi
+    ;;
+  '--user show --property=ActiveState --value graphical-session.target')
+    if [[ ${FAIL_SYSTEMCTL_ACTION:-} == "show-graphical" ]]; then
+      echo "state lookup failed" >&2
+      exit 1
+    fi
+    printf '%s\n' "${GRAPHICAL_STATE:-inactive}"
+    ;;
+  '--user show --property=ActiveState --value omarchy-sleep-lock.service')
+    printf '%s\n' "${SLEEP_LOCK_STATE:-inactive}"
+    ;;
+  '--user restart omarchy-sleep-lock.service')
+    if [[ ${FAIL_SYSTEMCTL_ACTION:-} == "restart" ]]; then
+      echo "restart failed" >&2
+      exit 1
+    fi
+    ;;
+  '--user stop omarchy-sleep-lock.service')
+    if [[ ${FAIL_SYSTEMCTL_ACTION:-} == "stop" ]]; then
+      echo "stop failed" >&2
+      exit 1
+    fi
+    ;;
+  '--user reset-failed omarchy-sleep-lock.service') ;;
+  *) exit 1 ;;
+esac
+STUB
+chmod +x "$stub_bin/systemctl"
+
+migration="$ROOT/migrations/1785608166.sh"
+
+run_migration() {
+  local home="$1" calls="$2"
+  shift 2
+
+  mkdir -p "$home/run"
+  HOME="$home" XDG_CONFIG_HOME="$home/.config" XDG_RUNTIME_DIR="$home/run" \
+    SYSTEMCTL_CALLS="$calls" PATH="$stub_bin:$PATH" \
+    "$@" bash -euo pipefail "$migration"
+}
+
+active_home="$test_tmp/active-home"
+active_calls="$test_tmp/active-calls"
+mkdir -p "$active_home/.config/systemd/user"
+printf '%s\n' '[Service]' 'ExecStart=/usr/bin/omarchy-system-sleep-monitor' \
+  >"$active_home/.config/systemd/user/omarchy-sleep-lock.service"
+
+run_migration "$active_home" "$active_calls" \
+  env GRAPHICAL_STATE=active SLEEP_LOCK_STATE=active >/dev/null
+
+dropin="$active_home/.config/systemd/user/omarchy-sleep-lock.service.d/90-omarchy-session-environment.conf"
+grep -Fx 'After=dbus.socket wayland-session-waitenv.service' "$dropin" >/dev/null ||
+  fail "sleep lock migration orders a retained unit after the session environment import"
+grep -Fx 'PartOf=graphical-session.target' "$dropin" >/dev/null ||
+  fail "sleep lock migration ties a retained unit to the graphical session lifecycle"
+grep -Fx 'ConditionEnvironment=OMARCHY_PATH' "$dropin" >/dev/null ||
+  fail "sleep lock migration gates a retained unit on the Omarchy path"
+grep -Fx 'ConditionEnvironment=WAYLAND_DISPLAY' "$dropin" >/dev/null ||
+  fail "sleep lock migration gates a retained unit on the Wayland display"
+pass "sleep lock migration repairs retained full-unit overrides with a drop-in"
+
+grep -Fx -- '--user daemon-reload' "$active_calls" >/dev/null ||
+  fail "sleep lock migration reloads the live user manager"
+grep -Fx -- '--user reset-failed omarchy-sleep-lock.service' "$active_calls" >/dev/null ||
+  fail "sleep lock migration cannot recover a start-limited monitor"
+grep -Fx -- '--user restart omarchy-sleep-lock.service' "$active_calls" >/dev/null ||
+  fail "sleep lock migration leaves an active monitor with its inherited environment"
+grep -Fx -- '--user stop omarchy-sleep-lock.service' "$active_calls" >/dev/null &&
+  fail "sleep lock migration stops the monitor inside an active graphical session"
+pass "sleep lock migration replaces the monitor inside an active graphical session"
+
+inactive_home="$test_tmp/inactive-home"
+inactive_calls="$test_tmp/inactive-calls"
+mkdir -p "$inactive_home"
+
+run_migration "$inactive_home" "$inactive_calls" \
+  env GRAPHICAL_STATE=inactive >/dev/null
+
+grep -Fx -- '--user stop omarchy-sleep-lock.service' "$inactive_calls" >/dev/null ||
+  fail "sleep lock migration leaves a stale monitor running after logout"
+grep -Fx -- '--user restart omarchy-sleep-lock.service' "$inactive_calls" >/dev/null &&
+  fail "sleep lock migration starts the monitor outside a graphical session"
+pass "sleep lock migration stops a monitor left behind after logout"
+
+failed_calls="$test_tmp/failed-calls"
+if run_migration "$test_tmp/failed-home" "$failed_calls" \
+  env GRAPHICAL_STATE=active SLEEP_LOCK_STATE=active FAIL_SYSTEMCTL_ACTION=restart \
+  >"$test_tmp/failed-output" 2>&1; then
+  fail "sleep lock migration marks a failed active-session repair complete"
+fi
+grep -F 'will be retried by omarchy-migrate' "$test_tmp/failed-output" >/dev/null ||
+  fail "sleep lock migration does not explain that a failed repair remains pending"
+pass "sleep lock migration keeps an active-session repair failure retryable"
+
+reload_failed_calls="$test_tmp/reload-failed-calls"
+if run_migration "$test_tmp/reload-failed-home" "$reload_failed_calls" \
+  env FAIL_SYSTEMCTL_ACTION=daemon-reload >"$test_tmp/reload-failed-output" 2>&1; then
+  fail "sleep lock migration ignores a failed user-manager reload"
+fi
+grep -F 'Could not reload the user service manager' "$test_tmp/reload-failed-output" >/dev/null ||
+  fail "sleep lock migration does not report a failed user-manager reload"
+pass "sleep lock migration keeps a failed user-manager reload retryable"
+
+stop_failed_calls="$test_tmp/stop-failed-calls"
+if run_migration "$test_tmp/stop-failed-home" "$stop_failed_calls" \
+  env GRAPHICAL_STATE=inactive FAIL_SYSTEMCTL_ACTION=stop \
+  >"$test_tmp/stop-failed-output" 2>&1; then
+  fail "sleep lock migration ignores a stale monitor that could not be stopped"
+fi
+grep -F 'Could not stop stale omarchy-sleep-lock.service' "$test_tmp/stop-failed-output" >/dev/null ||
+  fail "sleep lock migration does not report a stale monitor stop failure"
+pass "sleep lock migration keeps a stale-monitor stop failure retryable"
+
+state_failed_calls="$test_tmp/state-failed-calls"
+if run_migration "$test_tmp/state-failed-home" "$state_failed_calls" \
+  env FAIL_SYSTEMCTL_ACTION=show-graphical >"$test_tmp/state-failed-output" 2>&1; then
+  fail "sleep lock migration ignores a failed session-state inspection"
+fi
+grep -F 'Could not inspect graphical-session.target' "$test_tmp/state-failed-output" >/dev/null ||
+  fail "sleep lock migration does not report a failed session-state inspection"
+pass "sleep lock migration keeps an indeterminate session repair retryable"
+
+deferred_home="$test_tmp/deferred-home"
+deferred_calls="$test_tmp/deferred-calls"
+mkdir -p "$deferred_home/.config/systemd/user"
+touch "$deferred_home/.config/systemd/user/omarchy-sleep-lock.service"
+
+run_migration "$deferred_home" "$deferred_calls" \
+  env MANAGER_AVAILABLE=false >/dev/null
+
+[[ -f $deferred_home/.config/systemd/user/omarchy-sleep-lock.service.d/90-omarchy-session-environment.conf ]] ||
+  fail "sleep lock migration does not persist the repair without a live user manager"
+deferred_call_count=$(wc -l <"$deferred_calls")
+(( deferred_call_count == 1 )) ||
+  fail "sleep lock migration tries to mutate a user manager that is not running"
+pass "sleep lock migration defers safely when no user manager is running"
diff --git a/test/shell.d/systemd-test.sh b/test/shell.d/systemd-test.sh
index a232fd54..7d4f67c7 100755
--- a/test/shell.d/systemd-test.sh
+++ b/test/shell.d/systemd-test.sh
@@ -16,6 +16,16 @@ sleep_service="$ROOT/default/systemd/user/omarchy-sleep-lock.service"
 grep -Fx 'ExecStart=/usr/bin/omarchy-system-sleep-monitor' "$sleep_service" >/dev/null
 pass "sleep lock service uses the package-backed monitor path"
 
+grep -Fx 'After=dbus.socket wayland-session-waitenv.service' "$sleep_service" >/dev/null ||
+  fail "sleep lock monitor starts before UWSM imports the graphical session environment"
+grep -Fx 'PartOf=graphical-session.target' "$sleep_service" >/dev/null ||
+  fail "sleep lock monitor survives logout with a stale Wayland environment"
+grep -Fx 'ConditionEnvironment=OMARCHY_PATH' "$sleep_service" >/dev/null ||
+  fail "sleep lock monitor can start without the Omarchy shell path"
+grep -Fx 'ConditionEnvironment=WAYLAND_DISPLAY' "$sleep_service" >/dev/null ||
+  fail "sleep lock monitor can start without a Wayland display"
+pass "sleep lock service follows the initialized graphical session"
+
 first_run_units="$ROOT/install/user/first-run/enable-user-units.sh"
 grep -Fx 'systemctl --user daemon-reload' "$first_run_units" >/dev/null
 grep -F 'omarchy-sleep-lock.service' "$first_run_units" >/dev/null
@@ -23,6 +33,7 @@ pass "first-run reloads and enables the sleep lock service"
 
 upgrade_to_quattro="$ROOT/bin/omarchy-upgrade-to-quattro"
 grep -F '6870b232a6c0474b59187882e6d25ae771bba735098bcbedef8a2b73b97e2b6a' "$upgrade_to_quattro" >/dev/null
+grep -F 'bcd1a76cb5c63514922bc5e11af22ae480fc6d06a99863364e02bdf3c7bdceaf' "$upgrade_to_quattro" >/dev/null
 grep -F 'ExecStart=%h/.local/share/omarchy/bin/omarchy-system-sleep-monitor' "$upgrade_to_quattro" >/dev/null
 grep -F 'ExecStart=/usr/bin/omarchy-system-sleep-monitor' "$upgrade_to_quattro" >/dev/null
 grep -F 'reset-failed omarchy-sleep-lock.service' "$upgrade_to_quattro" >/dev/null