I NEVER write reviews, but this book is too brilliant to let pass. It is, for me, pitch-perfect, and the illustrations make it even funnier -- we have (now given away) an endless supply of the lovely books on which this is clearly based, the 'sheep are asleep beyond the hills' books. They seem so charming with your first baby . . .
As other reviewers have said, clearly pass on this book if you object to profanity -- that seems too obvious to mention, and I'm unclear on why anyone who objects to profanity, or thinks it too low-brow, would buy a book called "Go the @^#*(@^# to Sleep." Caveat emptor, no? Also pass on it if you are yourself not very funny, or your children are unusually docile. Finally, be sure to hide it from your kids -- I live in some terror that my kids will find this on the high shelf in my home office. With those caveats in mind, buy it now. I second the earlier reviewer who said it made him more patient in the bedtime ritual -- I just climbed down from the top bunk, at 37 wks pregnant, after consoling my 5 yr old about the 'sad part' of the book she just read (the dog goes back to its original owners), and the 2 yr old because the 5 yr old's sobbing was keeping her up, and thinking "just go the eff to sleep." I felt kind of zen about the whole thing, as opposed to cranky and annoyed.
Do not buy this for your friends having their first child; they won't appreciate it.