Although, no investors is happy when his investment is declining instead of appreciating but a good investor that have good understanding of the volatility nature of Bitcoin will not be under pressure when Bitcoin is in dip because the rate at which Bitcoin appreciate is much more than the the decline. And this is the reason why planing for long term investment is one of the unique quality of a good investor because if you hold a starch of Bitcoin for long term you will surely recover all the lost incur during the dip and still maximum your profit in the future.
Irrespective of any circumstances a good investor is always patience and perseverance and will always tend to sustain his investment for long term.