Hello everyone on this sunny winter day 🥰🥰 Could you please tell me wh...

Hello everyone on this sunny winter day 🥰🥰 Could you please tell me where you get information about how long a child should be awake and how much they should sleep at different ages? Especially up to 3-5 years old, the norms probably change every 1-6 months, right? I'm asking because I'm tired of searching for information on the internet, where it varies, and since 1.2 months we started following advice (I asked about the routine half a year ago) and by 1.5 years we seemed to have established a schedule, he sleeps great, meaning when he was awake for 5-5.5 hours, he slept for 2-2.5 hours. And he started sleeping better at night, sleeps through the day without needing to be woken up. We also stopped night feedings. But now he is 1 year and 7 months old, and for the past two weeks, every other day or so, he starts wandering around at night for 2-4 hours. Drooling a lot, sneezing and coughing from the drool, it's not a cold, the doctor said, I thought maybe it's the teeth affecting his sleep. But even before, when teeth were coming in, we didn't have such long nighttime awakenings. Currently, he's still awake for 5-5.5 hours before his nap and 5.5-6 hours before his night sleep, and he sleeps for 2-2.5 hours during the day. But at night it varies now, the 10-12 hours mentioned online are rare, mostly it's 7-8 hours, rarely 9-10 hours. I don't understand what I'm doing wrong 😩😩🙈 Please advise if you can. I can't afford to consult with sleep consultants due to financial issues 😢😢 I would be very grateful ❤️🙏🏻