Yes. I didn't learn until I was about 10 years old. Time was never important to me. I only learned then because I was embarassed when I asked the principal of my school what time it was, and he showed me his analog watch. As I stood there perplexed for a couple of seconds (which seemed like hours), he finally told me the time. I ended up teaching myself to avoid futher embarassment. But, it took me years to feel comfortable with it.
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Sleep is like the unicorn - it is rumored to exist, but I doubt I will see any.