diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
index 0b0e1572d12..d8657d84b95 100644
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -416,12 +416,16 @@ acpi_attach(device_t dev)
     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
 	OID_AUTO, "suspend_state", CTLTYPE_STRING | CTLFLAG_RW,
 	&sc->acpi_suspend_sx, 0, acpi_sleep_state_sysctl, "A", "");
+    SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
+	OID_AUTO, "sleep_delay", CTLFLAG_RD | CTLFLAG_RW,
+	&sc->acpi_sleep_delay, 0, "sleep delay");
     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
 	OID_AUTO, "s4bios", CTLFLAG_RD | CTLFLAG_RW,
 	&sc->acpi_s4bios, 0, "S4BIOS mode");
     SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
 	OID_AUTO, "verbose", CTLFLAG_RD | CTLFLAG_RW,
 	&sc->acpi_verbose, 0, "verbose mode");
+    sc->acpi_sleep_delay = 1;
     sc->acpi_s4bios = 1;
     if (bootverbose)
 	sc->acpi_verbose = 1;
@@ -1357,6 +1361,10 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
 	    break;
 	}
 
+	if (sc->acpi_sleep_delay > 0) {
+	    DELAY(sc->acpi_sleep_delay * 1000000);
+	}
+
 	if (state != ACPI_STATE_S1) {
 	    acpi_sleep_machdep(sc, state);
 
diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h
index 88c462e7b6b..ae94b051455 100644
--- a/sys/dev/acpica/acpivar.h
+++ b/sys/dev/acpica/acpivar.h
@@ -59,6 +59,7 @@ struct acpi_softc {
     int			acpi_standby_sx;
     int			acpi_suspend_sx;
 
+    int			acpi_sleep_delay;
     int			acpi_s4bios;
 
     int			acpi_verbose;