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  March 2, 2022 2:44 AM EST

  "We have some markers of sleep development. One is the percentage of REM sleep versus non-REM sleep. The other is the longest sleep period, the LSP – how long the baby can sustain a period of sleep without awakening," says Thomas Anders, a former psychiatry professor at the University of California-Davis and a sleep researcher for more than 40 years. "The longest sleep period lengthens; the number of awakenings decrease.