My wife's slept for what by now must be into the thousands of miles on the back. the first indication is when the front of her helmet taps into the back of mine - that wakes her up - at which point I sit a little more upright, so the next 'tap' is between my shoulder blades and she generally stays asleep; I then settle forward once again and she sinks down with me to sleep comfortably provided that it's a motorway/major highway, she'll sleep for hours. A few years ago she slept the whole way across Switzerland and only woke when I pulled into a petrol station in France.
She is a bit selfish about it though: As I say, she's slept for thousands of miles on the back and I've never complained, whilst I've only once gone to a sleep on the front and it was less than half a mile before she was waking me up annoyed and shouting.
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BobnLes
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