I have had 3 NST's over night. The first one they monitored a 40 minute strip because one of the babies was all over the place with it's heartbeat. My 2am was very easy so I got about 4 hours of sleep. I did my last NST at 6:30am and that was a joke. Both babies were moving so much we couldn't get them on the monitor. My morning doctor came in with the ultrasound and found them. Of course they were moving all around and very difficult to get a strip for even 5 minutes. After over 30 minutes of trying to get them on with ultrasound my doctor decided to give them a break to settle down and we will try it again in a little bit. Luckly both babies heartrates looked fine at that moment so he was not worried.
So this morning I have another NST when the babies decide to take a break and then another full ultrasound and another NST.