The diet you are currently following may not fulfill your energy needs - make sure you don't have too little carbohydrates as the cells need energy. further if you have diabetes it may also be that your diabetes is uncontrolled - check your glucose levels.
Not enough sleep during the night can also cause daytime sleepiness.
Other medical conditions that may cause daytime sleepiness: Hypothyroidism, obstructive sleep apnoea, depression, etc. - so i would recommend you consult your doctor if it continues and you do get enough sleep during the night.
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