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Low blood sugar can happen not just in the day, but at night too. Typically, blood sugar levels will fall at around three or four in the morning. Activation of the stress response and rushes of glutamate (see above) do nothing to aid restful sleep. Many individuals will be tripped into wakefulness, and may find it difficult to drop off again until about half an hour before the alarm goes off.

Once rudely awakened in this way, these poor unfortunates usually feel utterly dreadful. And the thought will normally occur to them as to why this level of zombie-like tiredness was not possible a few hours before.

Waking up feeling as if you’ve not really slept at all is obviously not the ideal way to start the day. Again, though, this feature of blood sugar imbalance is quite common, and it affects about half of my patients and clients on at least a semi-regular basis.