The Riddle

Here is a riddle to figure out Try to read between the lines I'll give you clues throughout the poem That will only be written in rhymes I'm always seen at Christmas Some people think I'm great I'm known for peeking your interest But I'll always make you wait The day before your wedding And I'm never far away You just can't wait till it gets here But I'll make it your longest day I'm always at the hospital When all the children are born And the night they're saying trick or treat As all the costumes are worn Well, have you figured it out yet? Can you tell me who I am? For I've given you all the possible clues That I absolutely can For some people I've even been known To give a slight tingling sensation I know you can't wait for the answer For I'm simply, anticipation