With group 1 drivers night time hypos during sleep are no longer considered relevant as far as fitness to drive is concerned unless there is concern over loss of hypo awareness, So if your hypos are during sleep then they don't count anymore as severe hypoglycemia.
Severe hypoglycaemia
The law defines ‘severe’ as an episode of hypoglycaemia requiring the assistance of another person.
Group 1 drivers - episodes of hypoglycaemia occurring during established sleep are no longer considered relevant for licensing purposes, unless there are concerns regarding their hypoglycaemia awareness.
Group 2 drivers - must report all episodes of severe hypoglycaemia requiring the assistance of another person, including sleep episodes.
Interstitial glucose monitoring systems
These devices are more widely known as flash glucose monitoring systems (FGM) and real-time continuous glucose monitoring systems (RT-CGM).
Group 1
These systems may be used for monitoring glucose at times relevant to driving Group 1 vehicles. Users of these systems must carry finger prick capillary glucose testing equipment for driving purposes as there are times when a confirmatory finger prick blood glucose level is required.
If using an interstitial fluid continuous glucose monitoring system (FGM or RT-CGM), the blood glucose level must be confirmed with a finger prick blood glucose reading in the following circumstances:
- when the glucose level is 4.0 mmol/L or below
- when symptoms of hypoglycaemia are being experienced
- when the glucose monitoring system gives a reading that is not consistent with the symptoms being experienced (eg symptoms of hypoglycaemia and the system reading does not indicate this) - see the INF294 leaflet in Appendix D for further details.
https://www.gov.uk/guidance/diabetes-mellitus-assessing-fitness-to-drive#insulin-treated-diabetes