I have what might be either terrible insomnia or just lesser need for sleep (totally undiagnosed). As long as I can remember I haven't been able to sleep for mu

I have what might be either terrible insomnia or just lesser need for sleep (totally undiagnosed). As long as I can remember I haven't been able to sleep for much more than 4 hours at a time, the odd times when I sleep ~6 I wake up feeling terrible and exhausted. I sleep 5~9am typically, and function fine if this is the case. If something requires me to wake up earlier than 9 it kills me for a few days. It's aslo near impossible to sleep before ~4am and some nights I'm unable to sleep at all.