As I've had several nights with numbers that have dropped while I sleep, I've decided to conduct some experiments with my overnight basal insulin. Last night was my first night decreasing my dose, and I started by taking 11 units of Levemir instead of 13. I will need to collect data for 2 more nights before I can confirm whether 11 is too much (or too little). Here's what I collected (and the graph to go with it):
*Note: Dexcom read 70 at 5:30am when I was really 90.
BG at 11:30pm: 115 (11 units Levemir given, slow decrease starts around 2am)
BG at 5:30am: 90 (decrease levels off and stays steady until about 9am)
BG at 6:30am: 86
BG at 9:00am: 74 (slight drop, 6g carbs, steady rise)
BG at 11:50am: 144 (13 units Levemir given, rise stops)
I'll be repeating this tonight and tomorrow night. If 11 is too much still, I'll try 10 units.