I go through cycles of good times "warm, calm, sleepy, sharp" and bad times "cold, anxious, alert-insomnia, fogy" This cycle takes around a week and mostly the bad side last longer.
I couldn't find out the cause by consulting doctors. I think it is related to thyroid or adrenals which needs time to recharge and pump adrenaline all over my body. By the way I have low cortisol at night.
I have central hypothyroidism (TSH is always suppressed) and I take levo 100 mcg and I tried to increase it but didn't help to rise T4/T3 to the upper level in the range.