Run catnap with one or more duration operands:
catnap NUMBER[SUFFIX]...
Each operand is a non-negative decimal number with an optional suffix:
sfor seconds, which is also the default when no suffix is supplied.mfor minutes.hfor hours.dfor days.
Multiple operands are summed, matching GNU sleep style:
catnap 1m 5s
The command accepts --help and --version. Invalid operands, missing
operands, unsupported suffixes, and unknown options are reported to standard
error with a non-zero exit status.