My lord Hamlet,
I have found all there is in your library regarding ghosts; the tales conflict, and I can't tell which are truthful. I don't think there's anything further I can find there, but I can tell you all that the books agree upon.
Sweet Hamlet, please, I think that as he has delivered his request and you have sworn to undertake it, your father's spirit may not rise again. If he should, I am certain Marcellus and Bernardo will wake us. We are not needed on the battlements every night; your father walked three nights before you came, and if he wishes again to speak to you, I am sure you will not miss him. My lord, you are hardly sleeping. I am idle here, I have no duties nor any place in court, and so I need not be alert for the day - but please, I beseech you, when men find themselves deprived of sleep, it is often they fall prey to illness or to some flaw in their judgement (judgement which you need most of all, now). You are becoming less active, Hamlet, I think we should leave our watch to the guards, who did first see the ghost.
Please, I pray you, rest a while.
Yours, in trust,
Seen only by Hamlet