What about my alarms throughout the house?
Will they wake me up as intruder enters my house while I am asleep.

Alarms may not catch the way intruder enters your house; plus alarms can be disabled by skilled intruders. More importantly, people often forget to properly activate alarms before going to sleep.

And even more importantly, even if your alarms work, you still want to prevent the intruder from quickly entering your bedroom by making your bedroom door very hard to open or kick in.

Regardless of how sophisticated your electronic security is, you still want to put a physical barrier between you and intruder.

Having a safe bedroom to retreat to and close the door is also very advantageous if intruder enters the house while you are somewhere else inside your house.