This pill worked great the first couple of nights. Then it wouldn't knock me out, it would just make me hallucinate. After about 10 minutes it would wear off, and I would be wide awake again. My doctor then put me on Ambien, which knocks me out and makes me groggy the next day. I've also found with Sonata, that if you eat anything close to your bedtime, it won't take affect at all. I have to take it on a completely empty stomach for it to work. I do feel good the next day,though, even if I've woken after only four hours.