Here's a wake-up call for the security conscious: You can now tote an alarm clock and a motion detector in one tiny package, 7 inches by 2 1/4 inches by 1 inch. Westclox's new SleepSafe Motion Detector with Alarm Clock separates into two plastic units. One is a digital alarm clock with a snooze button that you can keep bedside. The other is the detector, which uses infrared rays to sense motion at a door or window up to 15 or so feet away, then issues a piercing alarm if anyone tries to enter. Suggested retail is $29.95. For retail outlets or to order, call Norcross, Ga.-based General Time Corp. at (800) 272-8463.