diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
index 8aba3cc70ea1..5bbc68815dbc 100644
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -458,6 +458,7 @@ acpi_attach(device_t dev)
      */
     sc->acpi_enabled = 1;
     sc->acpi_sstate = ACPI_STATE_S0;
+    sc->acpi_sleep_disabled = 0;
 
     /*
      * Create the control device
@@ -1296,6 +1297,13 @@ acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
     return(AE_OK);
 }
 
+#define ACPI_MINIMUM_AWAKETIME	5
+
+static void
+acpi_sleep_enable(void *arg)
+{
+    ((struct acpi_softc *)arg)->acpi_sleep_disabled = 0;
+}
 
 /*
  * Set the system sleep state
@@ -1315,6 +1323,9 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
     if (sc->acpi_sstate != ACPI_STATE_S0)
 	return_ACPI_STATUS(AE_BAD_PARAMETER);	/* avoid reentry */
 
+    if (sc->acpi_sleep_disabled)
+	return_ACPI_STATUS(AE_OK);
+
     switch (state) {
     case ACPI_STATE_S0:	/* XXX only for testing */
 	status = AcpiEnterSleepState((UINT8)state);
@@ -1356,6 +1367,7 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
 	}
 
 	sc->acpi_sstate = state;
+	sc->acpi_sleep_disabled = 1;
 
 	if (state != ACPI_STATE_S1) {
 	    acpi_sleep_machdep(sc, state);
@@ -1392,6 +1404,10 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
 	status = AE_BAD_PARAMETER;
 	break;
     }
+
+    if (sc->acpi_sleep_disabled)
+	timeout(acpi_sleep_enable, (caddr_t)sc, hz * ACPI_MINIMUM_AWAKETIME);
+
     return_ACPI_STATUS(status);
 }
 
diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h
index 72c264e060d5..61918593e6cd 100644
--- a/sys/dev/acpica/acpivar.h
+++ b/sys/dev/acpica/acpivar.h
@@ -47,6 +47,7 @@ struct acpi_softc {
 
     int			acpi_enabled;
     int			acpi_sstate;
+    int			acpi_sleep_disabled;
 
     struct sysctl_ctx_list acpi_sysctl_ctx;
     struct sysctl_oid	*acpi_sysctl_tree;