Jupiterimages/Brand X Pictures/Getty Images. Panic is a natural reaction when you're served with a subpoena, but as far as legal documents are concerned, a subpoena duces tecum is one of the more innocuous ones you can encounter.
Circadian rhythms are biological oscillations that recur with a period of approximately one day. Health issues related to circadian rhythms include jet lag, shift work, seasonal depression, and time-of-day variations in response to medical treatments.
Understanding your bodyâs internal clockâor circadian rhythmâis the first step to better sleep. Your circadian rhythm (also known as your sleep/wake cycle or body clock) is a natural, internal system thatâs designed to regulate feelings of sleepiness and wakefulness over a 24-hour period.