Sleep-Wake Logger 1.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application was originally developed by My Web Kft. The application relates to System Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
Sleep-Wake Logger records the time when your computer enters sleep and the time when it wakes up. It keeps a log of all such events and the sleep/wake state your computer is in. You can choose to display the data as a pie chart or as a spreadsheet. Rolling the mouse cursor over the slices of the pie chart the start and end time of the slice are displayed along with the duration in minutes.
You may want to check out more software for Mac, such as Network Logger, Network Logger Pro or TM Error Logger, which might be related to Sleep-Wake Logger.