5.1 last night and 5.3 on raising but that doesn't tell the whole story.
Gym last night and from about 10pm, dropped to 75% basal rate. Even with that reduction, from midnight on my BG level declined, for Smartguard to kick in at 1am and suspend me for the two hour duration it maxes at. According to the sensor, I dropped to about 3.2 in that time.
During suspension, I started to climb as you'd expect, got up to about five, had a compression low from rolling about and suspended for 20 mins, before restarting and staying basically flat till I got up at 5am and 5.3.
Goes to show that I need a lower TBR after the type of gym session I had last night!