Warm feet promote the rapid onset of sleep


Even healthy people occasionally have difficulty falling asleep. Psychological relaxation techniques, hot baths, soothing infusions of plant extracts, melatonin and conventional hypnotics are all invoked in the search for a good night's sleep. Here we show that the degree of dilation of blood vessels in the skin of the hands and feet, which increases heat loss at these extremities, is the best physiological predictor for the rapid onset of sleep. Our findings provide further insight into the thermoregulatory cascade of events that precede the initiation of sleep1.

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Figure 1: Time course of the distal–proximal skin-temperature gradient (DPG).


  1. 1

    Campbell, S. S. & Broughton, R. J. Chronobiol. Int. 11, 126–131 (1994).

  2. 2

    Cajochen, C., Kräuchi, K., Danilenko, K. V. & Wirz-Justice, A. J. Sleep Res. 7, 145–157 (1998).

  3. 3

    Wirz-Justice, A. et al. J. Sleep Res. 7 (suppl. 2), 308 (1998).

  4. 4

    Kräuchi, K., Cajochen, C., Möri, D., Hetsch, C. & Wirz-Justice, A. Am. J. Physiol. 272, R1178–R1188 (1997).

  5. 5

    Weber, J. M., Unger, I., Wirz-Justice, A. & Schwander, J. C. J. Sleep Res. 7 (suppl. 2), 302 (1998).

  6. 6

    Rubinstein, E. H. & Sessler, D. I. Anesthesiology 73, 541–545 (1990).

  7. 7

    Kräuchi, K., Cajochen, C. & Wirz-Justice, A. in Circadian Clocks and Entrainment (eds Honma, K. I. & Honma, S.) 131–146 (Hokkaido Univ. Press, Sapporo, 1998).

  8. 8

    Gilbert, S. S., van den Heuvel, C. J. & Dawson, D. J. Physiol. (Lond.) 514, 905–914 (1999).

  9. 9

    Aschoff, J. Wien. Med. Woch. 19/20, 404–409 (1958).

  10. 10

    Foley, D. J. et al. Sleep 18, 425–432 (1995).

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Correspondence to Kurt Kräuchi.

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Kräuchi, K., Cajochen, C., Werth, E. et al. Warm feet promote the rapid onset of sleep. Nature 401, 36–37 (1999).

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