Setting aside that you didn't hear your phone this time,
@Woodywoodpecker, I personally believe Abbott have done all of us a disservice by calling these thresholds "alarms"; Dexcom use the much better term "alerts". We have drifted into a mindset that we have an alarm to influence us to immediately do something: eg get out of bed ready to start our day, or exit the building that's on fire.
But with a low BG alert set at 4.4, that can mean (because of the lag between actual and interstitial BG) that you are already on the cusp of being hypo and however fast acting the hypo response might be your BG will get you into the 3s before recovery gets going. Before CGM was widely available, it was inevitable that one would get mildly hypo, become aware from our body's inner warning signals (most people) that we were close to hypo, test then treat as necessary. My opinion is that although such hypos were inevitable in the low tech former days, this still was not a good way to proceed and time spent too low can cause cumulative cognitive decline.
Today the NHS provides so many of us with CGM in order that we can manage our wavering BG so much better. While this progress is terrific for all of us, sadly this is for financial benefit to the NHS, hoping to reduce future time needed in Hospital or providing Social care services. Meanwhile we have this smart device and surely it is better to have an Alert at 5.6 (the top limit with Libre for low settings) in order that we can take notice, assess what the trend is and respond accordingly.
In the mid 5's possibly no action is needed at all, your BG is just wavering around that mark and in practice it might rise back up a little on it's own. For me in mid 5's an alert in the small hours is a minor nuisance, but worth it for my longer term health. I might take note that overall I'm very stable and go back to sleep (or even adjust that low threshold down a little; if it then recurs I know I actually have a downward trend). Mid 5's might be an "alert" that my BG is definitely trending down (a glance at my graph can tell me a lot) and a small biscuit of c.5-8 CHO is all that is needed to safely nudge me away from that alert threshold and keep me above there. A single jelly baby will also do that, but that pure glucose doesn't add anything to sustain the BG rise. Equally, if that biscuit was nearer 10+ CHO, the consequent nudge up will be a bit stronger, but not massive; whereas 2x JBs can push me into a much bigger BG rise and create those unwanted spikes and troughs on my CGM graph.
Seeing the bigger picture: there is nothing wrong with keeping yourself in a safe place by having 5-7 as a range to aspire to achieve (accepting that between 4-10 is still extremely acceptable). But to my mind 4.4 is just too low to stop you from unnecessarily getting into hypo territory and causing you possible longer term cognitive decline. Do please reconsider why you feel 4.4 is sensible or appropriate, given how the current tech can help us so much more. [This is still despite that on this occasion you needed your husband to wake you from a deep sleep. I use an old enamelled mug as my amplifier!]
