Here's the website: ссылка

Thank you @emommy!

@keepingupwithhj, just found this:

"18 Month Sleep Regression

Oh, parents – this one is a doozie. Why? Because now your baby is a toddler – a walking, talking (well, babbling at least), tantrum-throwing toddler. This regression has a lot to do with your toddler’s new-found independence. She’s learning that – guess what – she has opinions and things! And – even better – she can express those opinions by shouting “NO!” at top volume! Separation anxiety also comes into play here; your toddler may genuinely be distressed when you leave at nap time, or when you walk out of the room at bedtime. Finally, teething is still a factor at 18 months – toddlers are often cutting molars (those big, painful teeth!) around this time."