See also Sleep Aids
and Sleep Applications for your phone or watch

Types of Sleep:

Given the precipitous increase in the use of sleep technology devices, the key findings are timely and relevant. This information complements the data these devices provide, helping millions of consumers interpret their sleep patterns. The report comes as the first step in NSF's effort to spearhead defining the key indicators of good sleep quality. The key determinants of quality sleep are included in a report published in Sleep Health. They include:

• Sleeping more time while in bed (at least 85 percent of the total time)
• Falling asleep in 30 minutes or less
• Waking up no more than once per night; and
• Being awake for 20 minutes or less after initially falling asleep.

The most accurate sleep analysis is done in a sleep lab:
Polysomnogram - You sleep in a lab and it records your brain waves, heartbeats and breathing as you sleep. It also charts your eye movements, limb movements and oxygen in your blood.

Actigraphy - An actigraph is worn like a watch on the wrist of your non-dominant hand and measures activity through light and movement. is used to assess cycles of activity and rest over several days to several weeks. Your doctor may ask you to wear an actigraph for a period of time to get an objective measurement of your sleep schedule.

CPAP Titration Study - Used to calibrate continuous positive airway pressure (CPAP) therapy. CPAP is a common treatment used to manage sleep-related breathing disorders including obstructive sleep apnea, central sleep apnea and hypoventilation and hypoxemia.

See: Sleep Education - Sleep Disorders Facts and Healthy Sleep Tips

If you're still a troubled sleeper, in addition to the cooler room temperature, you should try placing a hot water bottle at your feet or wearing socks. This will help dilate your blood vessels faster and push your internal thermostat to a more ideal setting. Best Temperature for Sleep | Sleep.org

People who sleep in hot environments have been found to have elevated levels of the stress hormone cortisol the next morning.
A study of people with a sleep disorder found that they slept longer in temperatures of 61 degrees Fahrenheit versus 75 degrees.
The most common recommendation, cited by places like the Cleveland Clinic and the National Sleep Foundation | sleep.org, is 60 to 67 degrees Fahrenheit.
A neurologist in Virginia told Health.com that the magic number is 65. Others have advised an upper limit of 64.

Regulating the temperature of just your feet or head is more precise than adding blankets, and more efficient than trying to regulate an entire room. (In truth, you could go much, much colder on the thermostat by simply adding more clothing and blankets. I've slept very well while camping in frigid weather with the right sleeping bag.
Summer Sleeping:
Summer sleeping is not as ideal, and many people do report getting worse sleep then. But it's possible to sleep well outside that ideal temperature range. A lot can be accomplished with a strategically placed fan. It's also definitely possible to train oneself to sleep without covers--without a sheet, even.> What is the ideal temperature for sleep? | The Atlantic December;, 2019

Research has also found that room temperatures as low as 60.8 degrees are best when people pile on the blankets.
WebMD says 60° is too cold for most people. They recommend 65-72°
Sleep.com says 60-67° is best.
Taking a warm bath will also help the body cool down before bed.
Women like it warmer than men.
and Best Temperature for Sleeping | Men's Health