There has been another more mysterious matter: every morning I lie awake for a while listening for the alarm until it drives me crazy. So I roll over and check the time. It is always somewhere between 4:15 and 5:00. So I immediately go back to sleep until the radio comes on at 5:55.
I slept poorly all my life, and the worst bouts of insomnia were accompanied by depression, anxiety and panic attacks until I started taking Remeron/mirtazapine in 2004. So sleep disturbances make me nervous.
Since 2004 I have been a sound sleeper and my state of mind has steadily improved. Lately I have been getting to bed by 11:30 at the latest, so I sleep at least six hours, which is enough. This habit of waking up too early is probably just part of adjusting to a new routine. Hopefully it will stop soon.