Hello thanks for asking from HCM
I can understand your concern. You are a healthy 66 years old male with average height and you have recently lost weight by exercise and by controlling diet. Now you have developed complaints of poor sleep. You sleep of 2-3 hours and it is followed by multiple awakening in night. It is also associated with day time
drowsiness and tiredness. As the complaints are causing impairment in day time functioning so I would advise you to consult a sleep specialist or
psychiatrist for treatment.
Improving
sleep hygiene with measures like avoiding tea/coffee in evening, avoiding day time naps, using bed only for sleeping and not using bed for reading or watching TV. Light exercise in evening will also help.
If improving sleep hygiene doesn't in improvement then medicines like benzodiazepines, Zdrugs etc can help.
Clonazepam, Zolpidem etc are commonly used. These medicines carry abuse potential so should be used for short term only and should be used with proper prescription only. Other medicines like
Melatonin, Ramelteon etc can also be used for good sleep. Visit a doctor for prescription.
Thanks, hope this helps you.