When i was undiagnosed, i couldnt work out how i felt worse first thing and about dusk and neither could the medics when i eventually had a Thyroid Storm and eneded up in hospital. But i realised that the body naturally makes adrenaline to wake you up and again to get you through the evenings after the 4-5pm lull.
I was hyperventilation at these times and told i was having a panic attack!! total rubbish