Have you had a sleep study to try to determine why an adequate number of hours sleep is not meeting your needs? You may have an underlying sleep disorder interrupting your sleep stages of which you are unaware. We hear a lot about sleep apnea and limb movements, but there are many sleep disorders. Nonrestorative sleep is hazardous to your ability to be appropriately alert, and can affect cognitive function. I would recommend seeking a cause before resorting to just treating the symptom.
You might be suffering from hypersomnia. It may present as excessive daytime sleepiness or nocturnal sleep of long duration (as much as 12 h or more) or sleep drunkenness. Patients do not get abnormal amounts of night sleep rather they have problems waking up in the morning and staying awake during the day.
The causes can be genetic, brain damage or medical disorders such as clinical depression, uremia and fibromyalgia. Sometimes hypersomnia may be due to other sleep disorders such as narcolepsy, sleep apnea, and restless leg syndrome. Your symptoms may be linked to depression.
You should consult a psychologist for a complete medical and psychological workup.
Do keep us posted about your progress.
Have you had your cortisol checked or your Vitamin D (do the 25-hydroxy test) checked?
Both of my results were low and I started supplements of both. Now I leap out of bed where for MONTHS I would wake up and take 10-15 mins to GET OUT of bed and then I was SO TIRED. As though I never slept.