What can I do to be able to sleep at nighttime?

It's 12:57 a.m., my time. And I can't sleep. I just ate a very heavy meal. It was cooked fried chicken was a grocery store, and I had some frozen baked fries. And I tried to go to bed at 10:00 p.m., but I had trouble. And now that I ate that meal, I'm still having trouble sleeping.

I'm a 34 year old, male. I'm 6 foot 1, and weigh 307.4 pounds. And now I know I gained weight yesterday.

What can I do to sleep?

I suffer from Schizoaffective Disorder-Bipolar Type.