I am exhausted. Cassie will not stay asleep in her bed for more than a half hour. and now she keeps…

I am exhausted. Cassie will not stay asleep in her bed for more than a half hour. and now she keeps acting like she is hungry and I keep giving her boob but she only sucks for a few seconds then sits there with my nipple on her mouth either sleeping or looking around. I tried to give her a paci since it seemed she wasn't hungry just wanted something to suck on but she wouldn't take it. but she was content with sucking on my finger. I just want to sleep but she always ends up screaming if I put her down.