Won't Stay Asleep!!

[Ncruze]

I dont know why, but my phone keeps waking up from sleep mode. Every time it wakes up i think someone's bout to text me or there's an incoming call but nothing happens, no email, no sms or call. I was at work and i had to put it back to sleep atleast 30 times. it's draining my battery, does anyone know what the problem is??