Becky, a 35-year-old mother, sleeps whenever her six-month-old baby does. even though becky and her infant get the same amount of sleep, according to consolidation theory, becky will spend time in sleep compared with her baby.

less; REM

Becky, a 35-year-old mother, sleeps whenever her six-month-old baby does. Even though Becky and her infant get the same amount of sleep, according to consolidation theory, Becky will spend less time in REM sleep compared with her baby.

The reason why "less time in REM sleep" would be the correct answer because she wouldn't be getting the right amount of REM time when she's sleeping.

REM sleep is the process that the brain goes through to "save" / "retain" memory for the long-term.

Becky could sleep at the same time her baby does, but it wouldn't fit the time, or the amount of that that she needs to sleep in order to go through the whole REM process. Becky could possibly sleep when her baby sleeps during the day, also the same thing in the night time. Becky wouldn't be getting her 8 hour recommended sleep in order to go through the REM process when she's following her babies sleep routine.