I don’t manually turn sleep mode on and off. I have it scheduled to turn on when I normally go to sleep and turn off at my normal wake up time. I believe you said you go to bed at 10pm so I would have my sleep mode set to turn on at 10pm as well. I mostly use sleep mode while I am sleeping because I do not trust a CGM 100% of the time so when I am asleep I would prefer that the system only increase or decrease basal but when I am awake I don’t have any issue with the automatic boluses since I can be aware of how I am feeling and make changes if necessary.
@Firenza - Great, thanks for clarifying! I’ve scheduled my sleep mode to my actual usual sleep time (10:00pm - 6:00am) to give that a try!
@Jay6 - Compression Lows - goodness! Another thing to look out for 
I seem to recall that from the manual so I’ll be sure to read up on it - thanks for the tip!
@Terry4 and @Robyn_H - Thank you both again for responding to my questions! I truly appreciate it! I literally went back and forth writing out the logic and then saying it out loud to try to make sense of it all lol.
I’m spending my weekend reading as much as I can on ISF, and I’m in the middle of a Tidepool webinar on ISF by Dr. Saleh Adi link here
@Robyn_H gave the perfect description with the phrase “violently and quickly” for what I’ve been experiencing: When your correction factor is too low, changes happen violently and quickly. Control-IQ will over-correct for any number higher than your target upper limit (120 in sleep mode, 160 in exercise mode, 180 in default), then send you crashing low, suspends too much insulin… Just to see you overshoot your target again, and start the cycle all over.
The above seemed similar to what the helpful author of this blog post said as well
“If your ISF is too weak (in other words the actual number is too low compared to reality of how strong the insulin is) in closed-looping, one of the most common symptoms you’ll see is a roller coaster of BGs where the temp basals are cycling between zero and high temping.”
Now that my night-time basal is working well, I’m actually noticing more volatility when I exercise (not due to any change that I made to the basal, but because I’m trying to exercise much more intensely - that’s for another post 
)
I re-read the ISF section of the Pumping Insulin book . It looks like 60% of my TDD is coming from basal, with 40% coming from bolus. I used the 2,000 rule for ISF and the calculation actually comes out to an ISF of 1:109.
Based on what @Terry4 suggested and what @Robyn_H suggested, I’ve created two new test Profiles: one with the ISF changed from 1:100 to 1:110, and another one with the ISF changed from 1:100 to 1:97 - just to do some N=1 experiments to see what happens 
It’s pretty clear that I’ll eventually need different ISFs for days hardcore exercise days, one for sleep, etc, but here goes nothin!
Thanks for all the great suggestions!
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