Catching position

Suddenly at 19 months, Tristan is really protesting bedtime in his crib.  Last night he woke up at 1:30am. I nursed him then layed him back down. He immediately stood up and started screaming in his crib.  We let him cry.  I fell asleep.. woke up around 4:30 and still heard him!!!!! Chris said he finally fell asleep at 5:30.  At 5:45 I went in to cover him, knowing he would be so cold.  I found him crouched like a baseball catcher in corner of his crib asleep!  Poor baby, fell asleep crying and "standing" up.  He lasted all day on like 6 hours of sleep and went down peacefully at 7pm.... I pray it lasts all night!!!!!!!!!!!!!