#!/bin/bash

MINUTES=${1:-30}

future_datetime=$(date -v "+${MINUTES}M")
future_time=$(date -j -f '%a %e %b %Y %H:%M:%S %Z' "${future_datetime}" '+%H:%M:%S')

echo "Sleep set to ${future_time}"

sudo /usr/bin/pmset repeat sleep MTWRFSU ${future_time}