Pregnancy aftermath...sleepless nights...please advise

Hi all,
Am back after my maternity leave! My baby girl still does not sleep throughout the night and since 4 months am having only 3-4 non-continuous hours sleep per day. Am very very tired and having severe dark circles and hair fall.
Would be grateful if anyone could suggest
1)how to tackle my sleepless nights,i.e. how to get my baby to sleep longer,
2)how to reduce dark circles
3)how to cope with hair fall after pregnancy
I hope all is well and wish all women be blessed with little angels:wave
Take care
Angeli