I get the same tingly sensation when milk comes in. Chase is similar at night time. I think he has his days and nights a bit muddled atm as he sleeps great during the day but when it comes to night he is wide awake. Always around 1ish and then he wants to start the day at 4:30am which isn't too fun! He is feeding 4 hourly during the day and then 3 hourly at night. Ive found the best way to get him to sleep is to bounce up and down on the exercise ball. Has worked the last 2 nights anyway. Im already looking forward to the stage where he sleeps longer than 3 hours at night!!
Hope all is well x