Reply To: Staying up tonight Home › Forums › Decaffeinated Coffee › Staying up tonight › Reply To: Staying up tonight May 14, 2013 8:48 pm at 8:48 pm #953484 Rav TuvParticipant PBT, Sorry but the minhag to stay up all night on Shavuos goes back to the Zohar. Much more thatn 400 years ago.