There are several theories but the two that seem to stick are that sleep: allows your body to replenish energy stores and repair itself. gives you the chance to save energy. Sleep may also aid learning and give our bodies time to organise all the memories of the hundreds of events we experience every day.
Softwood is also used in the production of paper, and for various types of board such as MDF (medium-density fiberboard). The finer softwoods have many special uses. they are used for making window frames,doors,frames,t.v. stands,flooring and beds.
Softwoods include trees such as pine, spruce, fir, cedar and juniper. Estimates will vary greatly depending on the size and location of the tree as well as whether it is a hardwood or softwood. For example, a 70-foot pine tree located in a yard on the West Coast costs about $700 to remove as of July 2012.