I love the alarm on the iPhone. It has a nice snooze feature, and you can set several different alarms - one for each day of the week - to help you wake up to that day's routine. I've gotten into the habit of plugging my iPhone into a charger right next to my bed. The next morning the phone wakes me, and it's fully charged.

Here's how to use the alarm:

First go to the alarm (Clock > tap Alarm).

Tap the "+" at the top right of the screen. Set the alarm up:

Repeat (adjustable from Never to each weekday) Sound (any of the ringtones in your system. I use "Alarm" when I have to get up and move, and "Blues" for the weekends, when life moves a little slower)