I wake up around 3-4 am often. I usually don't spend much time stressing - I go straight to reading and I may read up to about an hour before successfully falling asleep quickly most of the time. Sometimes I take a little melatonin at that time - which seems to help induce the peaceful, pastoral dreams that often occur in the second half of sleep. I have allowed a larger 'time window' for sleeping. Having an early work schedule was often stressful, I would stay up rather late and sometimes wake up anyway, lying awake in the dark wishing for sleep. It's worth it to find a sleep pattern that works because sleep is so important for health.