A blow horn. Go and blow a blow horn in their ear and they will wake up. make sure to run because they will hurt that person who do it. Also a phone is good because it vibrates too and usually is right by the bed if not on the bed.
apples are supposed to be more effective then coffe when waking you up in the morning and water always helps:)
I think this dog alarm would scare most off http://www.eaprotection.com/secure-dog.aspx
A high protein diet is most effective in the morning. If you ingest 30 grams of protein in the morning, within 30 minutes of waking up, you will lose the most weight.
Dark roast coffee typically has the highest caffeine content and can be the most effective at waking you up.
The most effective method for deterring burglars are a burglar alarm. It is a security system that detects when your house doors are opened and you have to enter a code to let them know it is not an intruder.
Prevented most people from dying in their sleep.
the alarm system that i have found to be most effective is ADT. The prices are a maximum of 1 dollar a day, ADT has been trusted for years to work and i would recommend it to everyone .
Systems that use motion sensors in combination with barrier sensors are most effective. Barrier sensors are triggered if a door or window is opened.
Most people purchase alarm clocks as a method to wake up or to alert them of some other time during the day. However you don't have to use the alarm part, you can just use it as a time telling device.
Out-doors
where will you most likely find fire alarm located
Anything could happen, however, for most people nightmares do not replay as waking events.