I posted on a Libre Facebook group about the overnight false lows (not compression lows), and several responded that they have similar experiences. That being said, as of last night, I’m no longer reading low all night - it looked perfectly normal - so it may just be the sensor sometimes has trouble reading correctly at night for whatever reason. The change for me could just be due to other factors, though: slight diet changes, no longer nursing baby overnight, etc.
A similar trend I’ve noticed that you will see below is that, generally speaking, if I’m on the low end of my range, the Libre will read lower than my meter. If I’m on the higher end of my range, it reads higher than my meter. It’s still very close, so not really an issue to me; just interesting.
Life’s been crazy, but here are the numbers from the past few days - I’m depending on the Libre more and more (as evidenced by the fewer finger prick tests), since it seems right on with my meter almost all the time and I’m so preoccupied with things it’s easier just to scan and go. I love it. I’ve been making some diet changes, and this first day I don’t think I was eating enough carbs, which is why my numbers were so great. 
1/22
7:30am 67 Libre, 69 ReliOn
9:45 105 Libre, 90 ReliOn
12:15 64 Libre, 76 ReliOn
1:35 74 Libre, 80 ReliOn
6:40 73 Libre, 72 ReliOn
8:00 79 Libre, 81 ReliOn
10:00 86 Libre, 94 ReliOn
11:00 72 Libre, 75 ReliOn
1/23
5:30am 65 Libre, 71 ReliOn
9:40 112 Libre, 133 ReliOn
6:10 92 Libre, 92 ReliOn
8:00 110 Libre, 113 ReliOn
10:15 104 Libre, 97 ReliOn
1/24
11:20am 91 Libre, 81 ReliOn
7:00pm 139 Libre, 125 ReliOn
8:45 142 Libre, 136 ReliOn
10:00 113 Libre, 112 ReliOn