BB Tour 9630 :: Need To Confirm Tour Key Lock / Standby Situation

I just upgraded from my old Curve 8330 to the Tour 9630, both on Verizon, and I couldn't be happier with my new device -- except for one thing. The Curve had a great "standby" function I could use at night, in which the phone would lock its keyboard and effectively shut down, but still be able to receive calls if one came in. This also saved lots of battery power. After hours' worth of mashing the top "lock" and "mute" buttons on the Tour, and searching through the internal menus, I can't seem to find a similar mode on my new phone.

First: If there's a thread about this already somewhere else, I beg your pardon; I'd be grateful for a link and I'll be on my way there. But if not, does anybody know whether some devices just do not have a standby mode anymore as part of OS 5, or whether there might be something wrong with my phone because its mute key won't activate standby mode?

The key lock button the top left works, but, at least on my Curve, the key lock and standby were two very different things -- I'd lock the keyboard when I put the phone in my pocket, but I'd put it on standby before bed every night. Does key-lock mode on the Tour replace standby?