No matter what time I go to bed anymore i feel like I never get enough sleep. I'm at work fighting…

No matter what time I go to bed anymore i feel like I never get enough sleep. I'm at work fighting to stay awake and it's been this way for at least 2 weeks.. I get light headed and just wanna sleep... What can I do? My appt is tomorrow so I'm definitely bringing it up to my dr. He's gonna hate me after tomorrow lol.. I have so much stuff to talk about!