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This is horrible - really sorry to hear this is happening to you. As far as I'm concerned, @BoscoPiko has become one of the trusted experts, with some most helpful observations and ideas dished out above. ^^^ Yep, sleep (definitely including naps) is truly a very common trigger. If you're going to take an imitrex pill, some have found that if taken at bedtime, it can prevent the sort of wake up attack that occurs somewhere in the vicinity of an hour after falling asleep. Strange yes, but it is often the nature of cluster cycles. Legions of us have recognized what seems to be a predictable, repeated cycle pattern, only to have it out of nowhere then become unpredictable, much as yours has. Speaking of legions of us, that's about how many are finding significant prevention success with the D3 regimen and/or busting. They can be a major game changer/life changer. Busting info can be found at the blue New Users - Please Read Here First banner above, near the top of the page ^^^.

Well shoot.. Sorry your here but glad you found this site. There is some correlation to sleep, circadian rhythm, biological clock etc. I don't know enough about that but here is a copy and paste of a write up on it: Discussion Cluster headache attacks are believed to be modulated in the hypothalamus; moreover, the severe pain and typical autonomic cranial features associated with cluster headache are caused by abnormal activity of the trigeminal-autonomic reflex. The temporal pattern of cluster headache attacks suggests involvement of the biological clock, and the seasonal pattern is influenced by the number of daylight hours. Although sleep is often reported as a trigger for cluster headache attacks, to date no clear correlation has been established between these attacks and sleep stage. Conclusions We hypothesize that light, sleep, and the biological clock can change the brain’s state, thereby lowering the threshold for activating the trigeminal-autonomic reflex, resulting in a cluster headache attack. Understanding the mechanisms that contribute to the daily and seasonal fluctuations in cluster headache attacks may provide new therapeutic targets. Anyhow were you doing anything to prevent CH when you were getting 3 years off? Are you on any preventative medication now? Many on here get nocturnal attacks and keep something like a red bull or 5 hour energy shot close by so they can down it and get straight to the o2 (for some reason the caffeine helps the o2 work faster) and most are able to get right back to sleep. I am thinking by the way you wrote "took" immitrex that you have it in pill form which can be somewhat slow acting verses injection. I am not suggesting that you use the immitrex that often as it has been known to cause extended cycles in some (myself included). I'm sorry you feel down and alone and I completely understand the feeling but do try and keep your chin up, surf the site as there is a plethora of good information on here that can help you. Hopefully some of the real experts will chime in here with better information soon.

Ok....we've got something to work with. Check your PM's in about five minutes.

Mitch....when you get a chance can you post up or PM me pics of the valve area? Built ins aren't something all that common here in my area.

Thx CHF just don’t want to fumble with knobs when in crisis mode. And saving 02 means less trips to the depot. Also I have 3 tanks and having built in valves makes it easier and less chance of forgetting valves and literally no set up times etc. Here in Canada I just pay for the tanks 45$. I’ll keep looking and god bless you for all your hard work and knowledge

I can see why you'd be incentivized to go for a demand valve for this aspect you mentioned: And that @Racer1_NC mentioned: Anyone who has been caught on a weekend, holiday or whatever having run out of O2 because they went into sudden unexpected high cycle and burned through tanks faster than anticipated might agree with me that there can be a priceless component to avoiding such a situation.

Here's is one... If you are using a welding regulator, more than likely you have an unlimited flow rate available to you, so you'd not benefit from a demand valve's increased flow. Here is a post I made a while back explaining things: I hope this helps a little.