Dr. Holly welcomes health coach, Sarah Corey, as a guest blogger this week. For more from Sarah and Dr. Holly on this topic, listen to their conversation about Struggling to Sleep: Is there Too Much Light in Your Bedroom?

Now, here's Sarah:

We all know that getting a good night sleep is an important part of a healthy lifestyle. Studies continuously show that achieving 7-9 hours of restful sleep nightly can have many health benefits including reduced the risk of chronic diseases, stress relief, improved cognitive function, weight control and even weight loss.

In our every connected digital age many of us are being exposed to light by our devices right up until the moment we get into bed, and for many of us, we even take these devices in bed! All light can disturb our sleep, however the light omitting from laptops, iphones and ipads is blue wave light, a wavelength that can be most destructive to our sleep cycle.

This light inhibits our pineal gland from releasing a hormone called melatonin, which helps reduce alertness and put you to sleep. At a very basic level melatonin production is stimulated by darkness and inhibited by light.

While light affects our sleep and health in many ways, there are four main ways that this lack of sleep may be affected our bodies:

Clinical depression is a mood state that goes well beyond temporarily feeling sad.

According to the Parkinson's Foundation, early recognition of Parkinson's warning signs can improve overall prognosis and keep the disease at bay longer.

For the right person, Accutane can not only be life-changing, it can be life-saving.

Across the globe, someone takes his or her own life every 40 seconds.

Curcumin, the active compound in turmeric, has been shown to prevent cancer, treat depression, and ease pain.

People may be thinking about depression; but are they talking about it and actually doing something about the depression epidemic?

The National Eating Disorders Association defines "orthorexia nervosa" as a fixation on righteous eating.

One in 17 people lives with a serious mental illness. But for many, mental illness remains a mystery.

The recent tragic suicide of Robin Williams highlights the national problem of depression and suicide.

According to a recent study, many older adults who visit the ER are either malnourished or at risk for malnutrition.

Depression affects more than 350 million people, and all too often causes a loved one to take his or her own life.

What role does stress play in children developing symptoms of IBS?

Did you know that one out of three women is abused at some point in her life?

PTLD occurs after a devastating love event, most likely a breakup, separation or divorce.

"Disability" doesn't just encompass people who are confined to a wheelchair.

Depression is stigmatized enough in the U.S. Can you imagine living in a culture where there is no word to describe it?

Before accepting a prescription medication for depression, might there be effective drug-free options you can try?

Without you even realizing it, modern day stressors could be posing a serious health hazard.

Bipolar disorder is often misunderstood; not only by the general population, but also within the medical community.

Even if you have a hard time with other types of meditation, Transcendental Meditation can be a very easy process to learn and practice.

Why in the world is a size 4 considered to be fat?

Physiological changes as you age are hard to accept, especially for women, since many women identify themselves by how attractive they are.

Actress Jennifer Esposito knows firsthand the "invisible" aspect that makes celiac disease so difficult to deal with.

Is there a way to turn your pain into positivity?

Even though the symptoms are the same in men and women, they often experience depression in different ways.

If you're considering giving up your child for adoption, what effect might that have on you down the road?

Do you really know how dangerous binge eating can be to your health?

Obesity can trigger psychological disorders including mental illness, depression, distorted body image and low self-esteem.

More kids and teens than ever are falling into the dark depths of depression. Learn the signs before it's too late.

Botox is used to help erase the lines and wrinkles that accompany age. But its benefits can extend far beyond cosmetics.

The way you communicate with your significant other, best friend, colleagues and family is changing. Might you need a social media detox?

Many people who have been sexually abused feel that a major piece of their spirit has been robbed. Learn how you can get it back.

Stress can wreak havoc on your health. Learn how loving yourself is the first step to a healthier, happier life.

Ever felt like you were "stuck" with negative thoughts, anxiety or depression because you figured you were just hard-wired to be that way?

Even though the need for revenge can be understandable, it is not healthy. Is there a way to overcome these feelings without causing any harm?

"Let your food be your medicine, and your medicine be your food" - Hippocrates

When overproduced, candida can release harmful toxins into your body and cause several health issues.

Research has shown that 90 percent of people who end their life struggled with depression or another mental health disorder.

Constant stress causes serious detriments to your mental and physical health. Do you know the right way to decrease your stress?

American teens are stressed and depressed... perhaps even more so than adults.

Why do some women suffer from postpartum depression and some do not?

Herbs are a safe, gentle and non-toxic way to stabilize your mood, particularly if you're a new mom.

Kundalini yoga is not just a great physical exercise, but also a way to empower your mental and emotional being.

Being a caregiver can be stressful and rewarding all at the same time. But as you care for another, you can't neglect your own health and wellness.

What happens to your adrenal glands when you're constantly stressed?

Learning how to eat like your caveman ancestors might be the best thing you can do for your health and wellness.

Remember the media blitz claiming you don't really need to take a multivitamin? Before you stop, make sure you know why you needed them in the first place.

Creating a positive synergy can promote positive health.

Why do people tend to eat more in the winter months? And is there anything you can do to change the pattern?