Can you please help me in these sentence to fix the sentence structure error.
1. If you're trying to avoid tossing and turning at night, you've probably already heard the typical advice cut off screens in the evening, avoid caffeine, and keep the room dark.
2. Looking at their sleep patterns over the course of five nights.
3. When a nutritionist provided healthy meals that were low in saturated fat and high in protein, the participants were able to fall asleep within 17 minutes, when participants chose their own foods, it took them almost 30 minutes to fall asleep.
4. Given that nutritionist meals were administered for three days, and "free" food days were only permitted for one day.