Put all of your Vagrant VMs to sleep.

sandman.sh

#!/usr/bin/env sh

vagrant=$(which vagrant)
awk=$(which awk)

printf "Gathering a list of machines. "
machines=$(vagrant global-status --prune 2>/dev/null | $awk '/running/ {print $5}')

if [ ! -z "${machines[@]}" ]
then
    printf "Putting them to bed. "
    for m in ${machines[@]}
    do
        test -d "$m" && cd "$m" && $vagrant halt > /dev/null 2>&1; printf 'z'
    done
    printf "\n"
else
    printf "They're all asleep!\n"
fi