I suspect that the sleep issue won't be resolved until he gets good control over the Clusters.

The list of meds he has/is taking hints at a doctor who is not sophisticated with treating Cluster. Please give us some info on the doc: have training in complex headache disorders?; what meds and doses have been tried?
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If you have the option suggest you consider seeking a headche specialist.
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LOCATING HEADACHE SPECIALIST

1. Yellow Pages phone book: look for "Headache Clinics" in the M.D. section and look under "neurologist" where some docs will list speciality areas of practice.

2.  Call your hospital/medical center. They often have an office to assist in finding a physician. You may have to ask for the social worker/patient advocate.

3. Multimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or ; On-line screen to find a physician.

4. Multimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or Look for "Physician Finder" search box. They will send a list of M.D.s for your state.I suggest using this source for several reasons: first, we have read several messages from people who, even seeing neurologists, are unhappy with the quality of care and ATTITUDES they have encountered; second, the clinical director of the Jefferson (Philadelphia) Headache Clinic said, in late 1999, that upwards of 40%+ of U.S. doctors have poor training in treating headache and/or hold attitudes about headache ("hysterical female disorder") which block them from sympathetic and effective work with the patient; third, it's necessary to find a doctor who has experience, skill, and a set of attitudes which give hope of success. This is the best method I know of to find such a physician.

5. Multimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or NEW certification program for "Headache Medicine" by the United Council for Neurologic Subspecialties, an independent, non-profit, professional medical organization.
        Since this is a new program, the initial listing is limited and so it should be checked each time you have an interest in locating a headache doctor.
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WHY A HEADACHE SPECIALIST IS RECOMMENDED


Headache. 2012 Jan;52(1):99-113.
Cluster headache in the United States of America: demographics, clinical characteristics, triggers, suicidality, and personal burden.
Rozen TD, Fishman RS.

THERE REMAINS A SIGNIFICANT DIAGNOSTIC DELAY FOR CLUSTER HEADACHE PATIENTS ON AVERAGE 5+ YEARS WITH ONLY 21% RECEIVING A CORRECT DIAGNOSIS AT TIME OF INITIAL PRESENTATION.

When in cycle, I take anywhere between 15mg and 21mg of Melatonin about 15 minutes before I lay down to sleep every night.  The Melatonin does help reduce the intensity of my night time wake up attacks, so I think.  Melatonin has been reported by many as helpful.  Everybody is different and dosages should be individualized.  Not knowledgeable on actual "sleeping pills."   Good luck

-Gregg in Las Vegas