“Seclusion” means the sequestration by placement of a recipient alone in a room which he has no means of leaving. The restriction of a recipient to a given area or room as part of a behavior modification program which has been authorized pursuant to his individual services plan shall not constitute seclusion, provided that such restriction does not exceed any continuous period in excess of two hours nor any periods which total more than four hours in any twenty-four hour period and that the duration, nature and purposes of each such restriction are promptly documented in the recipient’s record.