The nest chamber (which is used for sleeping, rearing kits and storing food) measures 10 cm (4 in) in diameter, and is lined with straw and the skins of the weasel's prey.
They get sleep kits, including personalised mattresses, when they stay in hotels.
The club's head of sports science, Alek Gross, told BBC Sport: "We do have players who have been prescribed individual sleep kits to aid their sleep throughout the week.
At our CAPS events, the Mental Health peers and clinical staff provided practical information through billboards, workshops, and sleep kits (with over 500 distributed within the 2 days!) and students took a break to enjoy each other's company in fun and creative activities (e.g., building mindfulness jars and stress balls; coloring; and playing in drum circles!).
$54,000 worth of materials (tents, hygiene kits, sleeping mats, school in a box, water jugs, drinking glasses, recreational kits, ECD kits, and additional school supplies such as exercise books, pencils, pens and slates) were made available in both the regions.
Number two is my sleep kit.
In response, tarpaulin sheets and other essentials such as blankets, soap, kitchen kits, sleeping mats and treated mosquito nets are being distributed.
His England and Leeds team-mate Jamie Jones-Buchanan says through meticulous preparation and dedication, Sinfield has effectively been a full-time professional since he was 13. "He has everything covered form how he eats, when he sleeps, his kit - everything is always the same," he admitted.
At the Park Hyatt Beaver Creek Resort in Avon, Colorado, the hotel restaurant's menu includes desserts and drinks that promote sleep, while VIP guests are provided with "slumber kits" in their rooms, complete with eye mask and ear plugs.
The children's agency is preparing: family kits containing cooking pots, blankets, water buckets, sleeping mats and soap; hygiene kits containing soap, toothpaste, slippers and towels; emergency health kits with drugs and equipment and water purification supplies.
