This mostly happens, when it is a first love, the texture of the feel is awesome.
Why you never gets sleep?
Every woman has a inner man called Animus and for a man it is Anima. Till you reach teenage this anima and animus will not have a specific face. But once you identified a mate these unconscious inner male or female get to have a face.
Once an inner has a face she will want you to nourish her that may be the reason we are not able to sleep well in love. That is a discovery of the true inner woman and it more of an enlightment rather than to call an infatuation.