Work out dream duration instantly with clear inputs, formula shown and shareable results.
REM time is the sleep duration times the REM share, and the cycle count divides total sleep by the length of one cycle. REM periods lengthen through the night, so the last cycles carry most of the vivid dreaming, which is why cutting sleep short disproportionately cuts dreams.
REM time
REM minutes = total sleep minutes x REM share
Cycles
cycles = total sleep minutes / cycle length
REM minutes = total sleep minutes x REM share. REM time is the sleep duration times the REM share, and the cycle count divides total sleep by the length of one cycle.
REM periods lengthen through the night, so the last cycles carry most of the vivid dreaming, which is why cutting sleep short disproportionately cuts dreams.
Enter total sleep, share of sleep spent in rem, length of one sleep cycle. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.