// Sleep is a measure of minutes and must be greater than 0
// is used to pause the loop() function. If you are checking for a start
// time of hours and minutes you do not want to use up processor
// cycles by checking the time every second. Every minute or so it good unless
// you are performing a more frequent activity.
// In this program we are turning on a relay for a period of time every day,
// so minutes are fine for a sleep delay.