Baby sleeping..

Cece • • мαмα σf 3 •

I have a 6 week old baby girl who sleeps in her bassinet at night. BUT will only sleep for an hour and a half at MOST. It's really tiring and it's driving me crazy. After my boyfriend leaves for work I let her sleep in bed with me and then she'll sleep for 3-5 hours. Is there any way I can get her to sleep for that long in her bassinet? She hates it in there and won't sleep in there unless she's already deep sleeping when I put her down.