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Your body is most sensitive to insulin between midnight and 3am (for normal sleep hours, not night shift workers). In a person without diabetes, their body reduces insulin levels automatically so that a hypo never occurs.

If you suspect your evening dose of long acting insulin (Levemir/Lantus/Tresiba) or your basal rate (insulin pumps) is too high, set an alarm at 2 a.m.

If your glucose does go low at night, reduce your night time basal insulin until your before bed to breakfast time BGL drops no more than 30mg/dl (1.6 mmol/l). If you use a pump, reduce your basal rate starting at 9pm or earlier.

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