english: The average [[sleep]] requirement is between seven and eight hours a day for an adult and nine to ten hours for a child; elderly people usually sleep for six to seven hours.
non_english: Â Â Â Â Â Â Â Â Â Â Â Â Â 9 Sep (ri);Â Â Â 22 Sep (ru);Â 19 Oct (ru);Â 16 Nov (ru);