Dear Sleep,
Where have you been? You have been neglecting your duties since December now and I feel that this extended leave of absence is entirely innappropriate and shows gross negligence, considering the importance of your role. If you do not return soon, I'm afraid I will have no option but to sit alone rocking/dribbling/playing with my toes/staring into space and saying "gaah?" to anyone who is stupid enough to ask me a question.
I mean it.
Yours sincerely,
SeaJay