In our modern world where everything is very organized and everyone needs to be very punctual, having an alarm clock to wake you up is a must. Every family has one and there is actually a tragedy when the gadget fails to do its job due to dead batteries or a mechanical failure.
There are many types available today, however they all fall under two main categories: analog or digital. The time of analog clocks is slowly ending as people have started to use digital alarm clocks as they have more benefits of the older types. The analog ones are those with arms. The actual hands are moving every second until the hour is finished. People say that the analog ones are usually more accurate than the digital types, however the digital models have some features and benefits that do not exist on the analog designs.
One of the most popular digital model is the combination of alarm and a radio. This is what most people are having on their nightstands next to their beds. They are popular as this way you can choose to be woken up by radio or a favorite tune (if they also have an embedded CD player, or in the more modern one an mp3 player).
The sleep and a snooze function is one of the added benefits of using an alarm. When you use the snooze feature, you can program the clock to go off again in a few minutes (usually 5-10 minutes later). The sleep feature allows you to have the radio on until you fall sleep and after a given period of time the radio will shut off automatically.
Nowadays there are many different types of modern alarm clocks that have made their permanent stay at homes of people. For example listening to your favorite tune while the sleep function is enabled is a great way to go to sleep. Also if you are one of those people that have to actually get out of bed to fully wake up, you can easily find flying gadgets that jump off the nightstands and you have to get up to stop it from emitting those annoyingises.
Also many individuals enjoy waking up gradually so they will have an alarm that starts off quietly and increases in volume in a regular fashion, so you are not woken up suddenly by a loud shrill that can easily destroy your entire day from the ground up.
And finally I personally like the alarm clock that has a vibrating feature included. This is perfect for people who have family sleeping next to them or who have a hearing problem and they can not hear the noise of the alarm anyway.