No Option to Set Timer For Ipod Touch To Go To Sleep

hello. when click on clock app set timer put ipod touch sleep, option no longer available. selections gives me buy ringtone, list of sounds, , stop playing. know how can retrieve option or settings need change in order option back?

 

wirelessly posted (mozilla/5.0 (iphone; u; cpu iphone os 4_2_1 mac os x; en_us) applewebkit/533.17.9 (khtml, gecko) mobile/8c148 safari/6533.18.5)

when stops playing, goes sleep.

 

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