I cnt sleep at 36 weeks pregnant..... Why??

I'm just about 36 weeks along, and I can't sleep.... I've tried taking a warm bath/shower and it doesn't work. Also had my husband try and massage me also doesn't work. I'm running out of ideas and so tired. I've been this way now for about 3 weeks. I only sleep for about 2 hours every night, and tired of it. Does anyone have any tips, I don't think I can take this anymore. Thank you