A few method to help tackle your problem
1) Turn here turn there is actually very normal. Even now at 5yo, my elder still turns and kicks us in his sleep.
2)Middle of the night suddenly cry are usually night terrors. So avoid having too much fun or laughter before bedtime.
3) Senstive nose can be dependent on many situation. Due to aircon? Due to dry air? You can use a humidifer to help him during his night sleep
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Badass Momma