i has been using Xyrem for 4 yrs. I was using 4.5 for long time. Now I can not tolerated, makes me feel drowsy, then an one after I take xyrem I woke up. Now im trying 3.0 I wake up 1/12 later, but I have more energy. I can t sleep, but I have the energy do to the chores between 11-3am. I take mi second dosis around 12:30pm. During the day I use modafinil 200mg twice a day. The only one that really help me is xyrem ,but now I feel that if I used I can t sleep to much ,but more energy.If I don t use xyrem I sleep all night ,but the next day i feel very sleepy, tired & I can t think clearly.