Some articles on sleep, sleep occurs:
... During sleep the computer monitor can display multiple channels continuously ... a readout of the brain activity that can be "scored" into different stages of sleep (N1, N2, N3 which combined are referred to as NREM sleep, and Stage R which is rapid eye movement sleep or REM, and ... This helps to determine when REM sleep occurs, of which rapid eye movements are characteristic, and also essentially aids in determining when sleep occurs ...
Famous quotes containing the words occurs and/or sleep:
“Everything one does in life, even love, occurs in an express train racing toward death. To smoke opium is to get out of the train while it is still moving. It is to concern oneself with something other than life or death.”
—Jean Cocteau (18891963)
“What care I for a goose-feather bed,
With the sheet turned down so bravely, O?
For to-night I shall sleep in a cold open field,
Along with the wraggle taggle gipsies, O!”
—Unknown. The Wraggle Taggle Gipsies (l. 3336)