Sleeping issues... Driving me nuts!!

So I've been on maternity leave since 36 weeks, I'm currently 38 weeks and I can't for the life of me sleep at night. If I'm lucky, I'll sleep for 2 or 3 hours.... But I'm exhausted all day and night, it's not like I have energy.  I've taken sleeping pills before that the doctor gave me, only problem is that even if I take half the dosage, I'm groggy all day the next day.  So either I get 2 hrs or sleep or I'm sleeping for 16 hrs straight.  At the end of the day, I just never feel rested. Anyone else feel this way??