"been using it for about 5 months and it has been a miracle worker until recently. a few weeks ago started having random sleepless nights. this week has been terrible waking up after 3-4 hours and feeling wide awake. not sure if my body is getting used to it but i thought i&#039;d check the reviews to see if anyone else has had the same problem. i hope this is a fluke because silenor really had changed my life and even though it was expensive it was worth being able to function the next day."