I had a very long April 23rd; left Japan in the evening, arrived back in San Francisco in the morning. Still April 23rd.
I was lacking a lot of sleep due to staying up all night on Tuesday/Wednesday and having little sleep on the plane. Yesterday, I made myself stay awake until sunset so I could somehow reset my internal clock. I went to bed around 9pm.
Today, I woke up at 5pm.
Granted, I did wake up a few times throughout the day; I went downstairs around 2pm to pick up my vacation mail. Still, I ended up staying in bed until 5pm.
I don’t think I have ever experienced such jet lag before. But, this is probably good, to sleep 20 hours in one night–I am forcing myself tonight to get to bed by 11pm so I can try waking up early tomorrow.