['I set the burglar alarm to the house every night before bed. Around 3:00am this morning, the alarm went off', 'Oh man thats scary! What set it off?', 'Thankfully it was just the contact that had come lose, so it thought the window had opened.  I had a really hard time going back to sleep after!']
I can imagine, i wouldnt have been at ease either.
I set the alarm to the house every night before bed.  Around 3:00am this morning, the alarm went off.  Thankfully, the contact had just fallen off of the window to make it go off, but it scared me so bad!