Hi, My Daughter Is 6 Months And Even In Normal

Hi, my daughter is 6 months and even in normal days she doesnt sleep at night. This is happening from the past 3 months.
She is completely sleep deprived. Hardly 3-4 hours she sleeps in one day.
She is massaged well and bathed everyday, fed properly all the times still this problem persists.
I guess its affecting her health and is all the time cranky.
What can be done, pls. suggest.