Lamictal gives me energy too. When I tried to go down to 50mg in the am, I felt totally drained Tues and Wed, so I went back up to 100mg in the am on Thurs and am back on 150mg total. I take the smaller dose at night because it doesn't make me drowsy at all. The reason why I split the dose and don't take it all in the morning is that I got headaches at night or in the morning from the mini-withdrawal. Just a thought. Hope taking it late in the afternoon helps you to still be able to sleep.