Since I started up with my Optygen regime again in January I've had trouble staying asleep. I have no problem falling asleep but somewhere between 3:30am and 4:30am I'm wide awake. This has happened virtually every night for about 6 weeks. I've tried mixing up my bed times but it makes no difference, last night I was out by 8:15pm and again at 3:23am wide awake. Anyone else having this problem?