People now get one to two hours less sleep each night, on average, compared to 60 years ago. A primary reason for this is the proliferation of electronics, which also allows us to work (and play) later than ever before.
The Internal Revenue Service requires that individuals be able to produce records proving any income, deductions or credit claimed for at least three years from the date of a return, the statute of limitations for how long the I.R.S. has to assess additional tax if all income was reported correctly.
It is important to keep business invoices for tax reasons in case your business gets audited. Business Victoria suggests keeping non-company financial records for five years and keeping financial records for companies, most employee records and all records of fringe benefits and capital gains for seven years.