I've been prescribed 37.5mg once a day then going up to twice a day after a week. I took it on Tuesday and Wednesday evening and got all of 3 hours sleep on Tuesday and about 1hour on Wednesday. Has anyone else experienced this? I've looked into it and some sites have said that the first week or so on it is rough but after that you should feel better. I'm just worried because I've had a migraine going on for over 4 weeks now and uni is really busy at the minute so can't afford to lose any sleep or take any more days off.