For many of us, it is much easier to remember our dreams when we wake up naturally rather than to the sound an alarm clock. Waking naturally allows our dreams to linger into our conscious mind as we slowly rise out of REM sleep.
Those who simply cannot live without an alarm clock should take advantage of down time in their schedules. The best time to practice dream recollection is during a weekend or a vacation, when you can maximize your opportunity to awaken with your body's natural clock. You can also take advantage of extended naps. During naps longer than 20 minutes, the brain goes into the REM stage of sleep, so we dream. If you are able to wake soundly from an extended nap, take advantage of this time to also recollect dreams.