My son is pumping. We are seeing a big jump (150 points or more) in the hours between 10 pm and midnight. So - when we do his post supper/parent bedtime check, he'll have a nice in-range number with some insulin on board. Check him at midnight and he's way up. Correct him, and he's down in range before wake-up. (Example - last night, 180 at 10 pm, 3 hours post bolus, 360 at midnight, corrected - he was down to 240 within an hour, and then he woke up at 120) He did this for a few weeks before Christmas, although he was a bit high at our bedtime check. We changed his sensitivity because it seemed like the corrections were ineffective. I now think that he was having this jump, and that's why the corrections didn't seem to work (because later corrections were more effective, and we even knocked him into the bottom of his range a few times). Then, he had some nice steady night time numbers, and even some later-night lows - so we didn't change the basal then. We are gradually upping the basal in te 10-12 time-frame, but I am concerned that when he stops having this jump, we're setting ourselves up for a nasty middle of the night low. I do not think the jump is diet related, as we are seeing it consistently without regard to his dinner. I would welcome some thoughts. Thanks!