"In 1925, under pressure from his publisher to submit a manuscript*, Arrhenius started getting up at 4am to write. As might be expected, rising at such an early hour had an adverse effect on his health"
(*Sidenote: publishers are like that)
Masterton and Hurley, Chemistry; "The Human Side" (pg 87)
Get your sleep. I had fallen behind in doze time in the past two weeks- and guess what. Friday, I wake up] with a sore throat. Fortunately, the 3-day weekend is allowing some sweet recuperation time. The sore throat, after 9.5 hours of sleep, is gone.