Cortisol is at its peak from the middle of the night through the early morning. The naturopath I work with online said that it is usually responsible for anxiety and racing heart upon waking.

The flower remedies can be powerful if they are used properly. There is an art to "prescribing" them. If you use the wrong one for the specific symptom, then no it isn't likely to make any difference. However, I have used cherry plum for over a year now when my cortisol is high, because it gently lowers it, and sometimes what it does feels almost magical. Rescue remedy can be good in certain situations but it isn't a blanket cure-all.

Linda.