biological clock

Simulated Mars mission reveals body’s sodium rhythms

Clinical pharmacologist Jens Titze, M.D., and colleagues have discovered that – in contrast to the prevailing dogma – human sodium levels fluctuate rhythmically with 7-day and monthly cycles.

Night nurse

Sleep strategy used by night nurses throws off their circadian clocks

As many as 25 percent of hospital nurses use sleep deprivation to adjust to working on the night shift, the poorest strategy for adapting their internal, circadian clocks to a night-time schedule.