Just swapped my Lumia 920 for a Galaxy S5, my first Android phone, and loving it! Standard unlocked UK model running on 3. Upgraded to Liollipop over Kies yesterday and been having the same problem everyone else has looking for a 'sleep mode'. I now understand I need to use Interruptions instead but I'm not getting the option to set Downtime like all the tutorials show. I've attached a screenshot to show I'm not going mad! I've tried a soft reset by removing the battery. Anyone else have this problem or a solution?