slept through a crucial phone call this morning

Just woke up to a voicemail from my boss asking me to call back ASAP. I was a bit confused as to why she was calling me so early, I figured she wanted to see me to do some sort of field work. I'm a landscape designer. Never saw that voicemail, never heard the phone ringing. No idea how this happened.<br><br>Edit: I'm surprised I got so many upvotes, but figured I'd mention what happened. It was a pretty funny misunderstanding. My boss is moving her house so she was asking me to water it each morning while she is away at work. I'm only 1.5mi from her house, not bad.