Had two really unsafe rides so far this year and they both happened late at night (12AM-2AM).
First was a 50 mile ride from BOS. The driver kept drifting all over the road and could not stay in the lane. It happened dozens of times over the course of the ride. Then he ran a stop sign and almost hit another car a block from my destination. I yelled at him and told him to go take a nap (assuming he was tired). I reported it to Uber and they refunded the ride. Happy with the refund, but they really need to be better about enforcing rest breaks for their drivers.
Second was last week in Sri Lanka. Taking an Uber from Colombo city to CMB, leaving at 12AM. The driver was fine until we got on the expressway. He wasn't speeding, but kept drifting out of his lane. I could see his eyes in the rear view mirror and saw him blinking longer and slower, a sign of him falling asleep. I had to yell at him several times because he nearly crashed into the median divider several times over the course of the ride.
Really unsafe and it's making me rethink using Uber entirely for late night rides.