I love the delusion that using a clock in a phone "saves energy." First, the phone must be charged. It takes MORE electricity to charge the battery than to just run the phone via the charger.}
Been in this field for over 35 years, todays batteries are very efficient, if you plug in an alarm clock and a smart phone charger for the same amount of time the clock will use more energy. check the KWH on the label.
{ And oh yes, the charger is not 100 efficient in converting the AC to DC, so energy is wasted there, too.
alarm clocks also run on DC the AC from the outlet goes through an A/D before powering the clock. Most of todays electronics are DC. If your charger is hot you should replace it, that wasted energy is given off as heat and indicates a faulty or underrated charger. this is a potential fire hazard, you need to replace it.
And then when the battery dies when it has reached it charge/discharge/recharge limit, it must be discarded, recycled, and new battery built.}
Batteries are recycled and yes there is some waste but the technology is improving daily.
{
{Compare all that to a clock radio that lasts perhaps 10 years. I wonder if the poster is using a 10 year old phone, or expects to ever keep a phone for 10 years?}
No probably 2-3 years tops, with the iphone 7 out it may be less, but I might wait for the 8 which is supposed to be the cats ***.
{Or is the poster talking about the energy required of the user? Because if I wake up at night, roll over, look at the clock, and then go back to sleep, it takes a LOT less energy than waking up, rolling over, grabbing the phone, activating the phone, putting the phone back down, and rolling back to sleep.}
Unless I plan on getting up I really don't care what time it is in the middle of the night, I'm sleeping
{I'll believe clocks are obsolete when I see businesses sending workers to take them down from walls.}
look around, there were clocks on every corner or store window, there are no where near as many as there were when I was a kid, you only see them in parks and historic districts it's sad because many of them were beautiful.
{Or maybe when Disney removes the clocks from the hot tubs, because, hey, everybody in the tub is sitting there with a phone.}
They have timers and yes a clock as required by law but I have never seen an alarm clock that is what we have been talking about or did you forget.