Hello,
Thanks for posting your query at DoctorSpring.com
I have gone through your question in detail and I can understand what you are going through.
The common causes for excess sleep are :
1) sleep Apnoea
2) Hypothyroidism
3) Depression
4) Physiological Variant.
The first option of sleep apnoea has been ruled out by you.
Hypothyroidism can be the causes as the TSH is still 6. You may require a higher supplementation of thyroid, like if you are taking 25micgm then you may require 50micgm.
Depression can be a cause of excess sleep but then there has to be symptoms of depression like sadness of mood, reduced interest in work, hopelessness, worthlessness etc. If so then the treatment will; be with Bupropion or Fluoxetine etc.
Some people have a natural excess sleep requirement. You may consider taking methylphenidate (10mg/30mg) or Modafinil (100mg/200mg) to stay awake.
Further you should also try changing the sleep medications as well. Instead of zopiclone, you may consider ramelteon which is more natural sleeping aid.
Hope this helps,
In case if you have any further query, do let me know.
Do meet your doctor and discuss these options.
Kind regards
Dr. Srikanth Reddy