More ideas:
Daily Interactions:
And another take from my experience, is that I would crash after a certain number of, or a certain intensity of, interactions in the day. Without knowing it, I was always taking blame for situations, felt powerless, had tons of underlying sadness.
Denial:
In my undiagnosed days of PTSD, I was intellectually in denial of how emotionally sensitive, and how frequently I was triggerred (I was frozen in fear); so sometimes, I had no clue why I was crashing, and other times I did.
Diet:
I investigated how diet effected my moods. Eliminating one food item, one week at a time, I was able to see how caffeine, wheat, dairy, corn, sugars, and soy, effected my moods and energy.
REM sleep deprivation:
And it is common to need to crash if you aren't getting 4-7 hours of sleep, at once. You may even seem to be sleeping for 5 hours at a time, but it is not deep sleep. A sleep study, or medical or naturopathic doctor may have some good suggestions to you.
Nutrition:
My energy improved with a low therapeutic level multivitamin (e.g. B vitamins 10-50 mg, zinc 10-50mg, etc.)
Meditation:
Mindfulness/Vipassana meditation helped me find rest/restoration without having to sleep. It was, and still is, a helpful thing to do in the morning to be in my body, and a it is a helpful thing to do, to wind down in the evening; even if you start with 2 minutes and gradually build up to 20-30 minutes.
Anxiety:
My un-recognized anxiety, was also an energy drain.
I hope you feel better.:)