Lightweight Cooling Comforter | Slumber Cloud® – Slumber Cloud

In meteorology, a cloud is an aerosol consisting of a visible mass of miniature liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may compose the droplets and crystals. On Earth, clouds are formed as a result of saturation of the air when it is cooled to its dew point, or when it gains sufficient moisture (usually in the form of water vapor) from an adjacent source to raise the dew point to the ambient temperature.

Clouds are seen in the Earth's homosphere, which includes the troposphere, stratosphere, and mesosphere. Nephology is the science of clouds, which is undertaken in the cloud physics branch of meteorology. There are two methods of naming clouds in their respective layers of the homosphere, Latin and common name.

Genus types in the troposphere, the atmospheric layer closest to Earth's surface, have Latin names because of the universal adoption of Luke Howard's nomenclature that was formally proposed in 1802. It became the basis of a modern international system that divides clouds into five physical forms which can be further divided or classified into altitude levels to derive ten basic genera. The main representative cloud types for each of these forms are stratiform, cumuliform, stratocumuliform, cumulonimbiform, and cirriform. Low-level clouds do not have any altitude-related prefixes. However mid-level stratiform and stratocumuliform types are given the prefix alto- while high-level variants of these same two forms carry the prefix cirro-. In the case of stratocumuliform clouds, the prefix strato- is applied to the low-level genus type but is dropped from the mid- and high-level varients to avoid double-prefixing with alto- and cirro-. Genus types with sufficient vertical extent to occupy more than one level do not carry any altitude-related prefixes. They are classified formally as low- or mid-level depending on the altitude at which each initially forms, and are also more informally characterized as multi-level or vertical. Most of the ten genera derived by this method of classification can be subdivided into species and further subdivided into varieties. Very low stratiform clouds that extend down to the Earth's surface are given the common names fog and mist, but have no Latin names.

In the stratosphere and mesosphere, clouds have common names for their main types. They may have the appearance of stratiform veils or sheets, cirriform wisps, or stratocumuliform bands or ripples. They are seen infrequently, mostly in the polar regions of Earth. Clouds have been observed in the atmospheres of other planets and moons in the Solar System and beyond. However, due to their different temperature characteristics, they are often composed of other substances such as methane, ammonia, and sulfuric acid, as well as water.

Tropospheric clouds can have a direct effect on climate change on Earth. They may reflect incoming rays from the Sun which can contribute to a cooling effect where and when these clouds occur, or trap longer wave radiation that reflects back up from the Earth's surface which can cause a warming effect. The altitude, form, and thickness of the clouds are the main factors that affect the local heating or cooling of the Earth and the atmosphere. Clouds that form above the troposphere are too scarce and too thin to have any influence on climate change. Clouds are the main uncertainty in climate sensitivity.

A comforter (in American English), also known as a doona in Australian English, or a continental quilt (or simply quilt) or duvet in British English, is a type of bedding made of two lengths of fabric or covering sewn together and filled with insulative materials for warmth, traditionally down or feathers, wool or cotton batting, silk, or polyester and other down alternative fibers. Like quilts, comforters are generally laid over a top bed sheet (and sometimes also blankets) and used to cover the body during sleep. Duvets are another form of quilt, traditionally filled with feathers, though since the late 20th century often made of synthetic fibres or down alternatives.

A comforter is sometimes covered for protection and prolonged use. Comforter covers are similar in principle to pillowcases, usually closed with zippers or buttons.

In the United Kingdom, the term comforter is not generally used. It is instead called a quilt (or continental quilt), a duvet or an eiderdown. A duvet differs in that it is thicker and usually used with a cover, and without blankets or extra sheets.

In Indonesia, the term comforter is not generally used. It is instead called a Bed Cover. Usually bed cover is sold in packages containing sheets and comforter.

Sometimes a comforter is sold as part of a "bed in a bag", usually a case of some sort with handles that contains an entire set of bedding in the same or a matching pattern: comforter and top sheet, fitted sheet, pillowcase(s), and perhaps pillow sham(s). Some sets have a duvet and duvet cover (more popular in Europe) in place of a comforter and top sheet. More deluxe sets may include a bed skirt and pillows.

Comforters are usually used in the winter season when it is very cold, although a variety of different thicknesses means that they can be used in other seasons as well, with lighter examples being used in warmer weather. Due to the thickness of a comforter or the amount of down/feathers or other filling it has, a person is insulated against cold.

Comforter sizes correspond with bed sizes: twin, full, queen, king, and cal-king. Comforter sizes run slightly larger than mattress sizes to allow for draping over the sides of the bed. Typical sizes in the United States for comforters are:

• Twin Bed = 64 in (163 cm) width × 87 in (221 cm) length
• Queen Bed  / Full = 87 in (221 cm) width × 87 in (221 cm) length
• King Bed = 101 in (257 cm) width × 90 in (229 cm) length

Cooling is removal of heat, usually resulting in a lower temperature and/or phase change. Temperature lowering achieved by any other means may also be called cooling. The transfer of thermal energy may occur via thermal radiation, heat conduction or convection. Examples can be as simple as reducing temperature of a coffee.

Slumber is another word for sleep.

Slumber may also refer to:

• laziness, indolence or inaction
• Slumber (dog), prize winning Old English Sheepdog
• Slumber (band) at Okeechobee Music & Arts Festival
• "Slumber", award-winning single by Christian Rock band Needtobreathe
• "Slumber", signature single of Malaysian band OAG (band)
• "Slumber", song by Die Monster Die from the album Withdrawal Method
• "Slumber", song by Elvin Jones from the album Genesis
• "Slumber", song by Bad Religion from album Punk Rock Songs
• Slumber (film), a horror film released in 2017
• Slumber Tsogwane (born 1959), Botswanan politician