My 9 month old refuses to sleep properly. He wakes up every two hours during the night and will cry for between 30 minutes to 2 hours before falling asleep again. Nothing I do improves the situation. Last night he woke up every hour and at one point cried for 3 hours, absolutely none stop.
If you allow him out of bed (mine or his) he immediately stops crying, but is clearly extremely tired. He will nap during day two or three times, but never for more than 30 minutes
Development wise he's fine, but I have completely lost my mind with tiredness, having not slept for more than a couple hours unbroken for approaching a year.
The boy has an iron will and a seemingly unlimited ability to resist sleep. He won't accept food, cuddles, water or anything during the night. The only thing that stops him is letting him not sleep.