Heavy Sleepers

There was a VERY loud thunderstorm last night...I swear that for some reason storms are bigger and louder at our new house. There was a HUGE clap of thunder at about 4:00 in the morning...you know the kind where the storm is so close that the lightening and thunder are about simultaneous? I jolted up into a sitting position with my heart racing. I was sure the kids would be freaked out, so I went to check them. They were both sound asleep and didn't look like they had even flinched! Why can't I sleep like that?