Complete the summary below.
Choose NO MORE THAN TWO WORDS from the reading passage for each answer.

Keep a good [1] by following routines. Try to sleep and wake at roughly the same times when working and on days off.

Use [2] noise to help you sleep if there are external distractions.

Small and regular meals keep your [3] operating at its best. Limit changes to your work shift, and if necessary take a short  [4] during the day.