Because you don't want to stroke out and die if you are lucky? And if you are unlucky, you get to spend the rest of your life disabled.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

but will tell you what helped at my house:
We fought the bedtime battles and get up and get ready in the AM battles and one day I'd had too much. New Rule: Stay up as long as you want and do whatever you want but you all have alarm clocks and you are now responsible for all your own morning routine. At (insert time here) I will be in the car to take you to school and at (previous time + 5 min) I will be gone (or back in the house or whatever). If you forget something it won't affect anybody but you so I don't care, I already have my diploma.
I realize everybody's logistics are different and all kids are different too but once they get the idea that their behavior is only impacting them negatively it loses its novelty.
BTW, started this 3 years ago when they were 10, 12, 14; 16.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".

You all mention boys at that age...well, despite the alleged maturity level of girls, any of those scenarios would fit my daughter!

I think during adolescence, a section of brain goes dormant...I'm certain of it!

But in order to reduce the stress in my already-tense life, I've learned to ignore some of those lapses in her behavior and let her suffer the consequences.

Today, I drop her off at school, drive off, and shortly thereafter, catch a glimpse of her house keys and cellphone resting on the seat beside me...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

I was on linsporil from the V.A. I hated it,you had to counter effects with Viagra.
I switched to taking garlic oil capsules 2000mg a day.Haven't needed bp medicine for 3 years.

Aklim is right, I didn't pay attention to my BP, and about 2 years ago I had a stroke, messing with your BP can KILL you. It took me about 6 months to recover. And the damage is done. I can't remember anything and I can't seem to spell words correctly and get very confused sometimes. TAKE CARE OF YOU HEALTH.