Hi. Im Not Sure If This Falls Under Mental Health

Hi. Im not sure if this falls under mental health but the past few weeks ive not been able to sleep at night time. Its like my body cences the sun go down and if i do try to sleep i start to get really hot and i will fall into a sleep like state but my body is still awake and i start havibg nightmares until i wake up. I hsve to wait till the sun is up before i can comfortably sleep. Do you have any knowledgeable of what could be happening?