Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ambient heat and human sleep   Ambient temperatures are rising globally, with the greatest increases
recorded at night. Concurrently, the prevalence of insufficient sleep is
increasing in many populations, with substantial costs to human health and
well-being. Even though nearly a third of the human lifespan is spent asleep,
it remains unknown whether temperature and weather impact objective measures of
sleep in real-world settings, globally. Here we link billions of sleep
measurements from wearable devices comprising over 7 million nighttime sleep
records across 68 countries to local daily meteorological data from 2015 to
2017. Rising nighttime temperatures shorten within-person sleep duration
primarily through delayed onset, increasing the probability of insufficient
sleep. The effect of temperature on sleep loss is substantially larger for
residents from lower income countries and older adults, and females are
affected more than are males. Nighttime temperature increases inflict the
greatest sleep loss during summer and fall months, and we do not find evidence
of short-term acclimatization. Coupling historical behavioral measurements with
output from climate models, we project that climate change will further erode
human sleep, producing substantial geographic inequalities. Our findings have
significant implications for adaptation planning and illuminate a pathway
through which rising temperatures may globally impact public health.

3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph