Constantly falling asleep 11weeks

Cheryl • Mammy to son age 6 and blue bump arriving New Year`s Eve 2015!
Hi, I know your more tired first few months but it's beyond a joke I sleep all night wake at 5 for 10/15 minutes and back to sleep, im falling asleep on bus, soon as Iv come back from school run, waiting on te bath to run. As soon as I sit down , my previous pregnancy was nothing like this :( any ideas to atleast ease it and give me some energy ? Xx