"i was on the 2 wk trial, on the 9th day i started having insomnia, my doctor decided to keep me on the 3.75 for another 2 wks to see if it went away but has not, i only get 3-4 hours sleep a night and i take it around 8am. i feel the medication really helps with weight loss, i have lost 5 lbs in 17 days, but am getting too exhausted to keep taking it. i will try belviq."