Where do you set your low alarm threshold for sleeping? One of the things hypoglycemia does to me while sleeping is to make me sleep more deeply, less able to be aroused. With the 15-minute lag from actual blood glucose to a CGM number, combined with a low alarm threshold set too low might be a part of your problem.
Are lows during the night, as shown on your CGM trace, a steep dive into hypoglycemia or do they settle slowly into the low?
I've experimented with putting the Dex receiver in a ceramic or glass cup on my nightstand. When it alarms It makes a sound I couldn't imagine sleeping through.