World-Class Care

Kimberly grew up in both Colorado and Arizona and earned her Doctor of Advanced Nursing Practice (DNP) from Arizona State University. She has devoted her career to pediatrics, beginning as a Nurse Practitioner in Otolaryngology at Phoenix Children’s Hospital before joining the inpatient Pulmonology team at Children’s Hospital Colorado. Kimberly loves working with children and finds joy in their smiles, personalities, and positive outlooks on life. She’s passionate about helping kids achieve better sleep and reach their full potential.

Outside of work, Kimberly enjoys walking her dogs, playing board games with her children, hiking in the mountains, and spending time in the water—especially scuba diving.

Renee was born in Tuscon, Arizona and grew up in central Louisiana before moving to northern Colorado where she has spent most of her adult life. She worked in various pediatric subspecialty areas at the University of Colorado and Children’s Hospital before completing her Masters of Science in Nursing at the University of Colorado Anschutz Medical Campus. She enjoys working with children and their families to partner with them, to help them to live their healthiest and best lives. She is amazed how some children with significant health and mental/behavioral challenges, have the most amazing attitude and outlook on life. Through working with kids, her outlook on life has become more positive. She learns something new from children, adolescents and their families every day. For fun, Renee enjoys reading, dancing, theater, horseback riding, camping, hiking, skiing.

Katelyn grew up in Spokane, WA. She attended school at Connecticut College for her undergraduate studies, and Columbia University School of Nursing for her master’s in nursing. Katelyn worked with kids in pediatric GI in the Bronx, NY before moving to Colorado. Her favorite thing about working with kids is that they are candid, which sometimes makes visits hilarious. She also likes how treating kids can impact the entire family. When she is at home she likes to walk, hike, run, practice yoga, and do arts and crafts with her kids.

Heather Singh grew up in Marlton, New Jersey. She attended college at the University of Pennsylvania where she received her BSN. After graduation from Nursing school, she spent 11 years in a hospital working in Hematology/Oncology, Pediatrics, NICU, and Maternal-Child services. She continued her education at the University of Colorado where she received her MSN and became a Pediatric Nurse Practitioner. Following that, she spent 4 years working in an Adult Otolaryngology practice then moved to a Pediatric ENT practice for 10 years before joining Pediatric Sleep Specialists in May 2023. She enjoys working with kids because of their sense of humor. She likes to view the world from their perspective, and learning from their insights. When Heather is not working, she enjoys being a spectator at her kid’s sporting events. She also likes hiking, camping (all seasons), canoeing, traveling and cooking ethnic foods.

Linda Spangenberg, MSN, APRN, CPNP-PC is a dedicated Pediatric Nurse Practitioner with over two decades of diverse nursing experience. She began her career after earning a Bachelor of Science in Nursing from Southwestern Oklahoma State University in 2000, working in rural hospital settings where she developed a strong foundation in emergency care. Her time in the ER honed her clinical judgment and deepened her passion for serving underserved communities.

After relocating to Houston, she transitioned to school nursing, providing compassionate care to elementary-aged children and serving as a vital health resource for students, families, and staff. Inspired to expand her impact, she pursued advanced education and earned her Master of Science in Nursing with a pediatric focus from Houston Christian University in 2019.

In 2020, she became a board-certified Pediatric Nurse Practitioner by the Pediatric Nursing Certification Board (PNCB). Since then, she has been committed to delivering high-quality, family-centered care to children across a range of clinical settings. Her approach blends clinical expertise with a warm, empathetic presence, making her a trusted advocate for her young patients and their families.

She became a Pediatric Nurse Practitioner to expand my impact—not just in treating illness, but in promoting wellness, educating families, and being a consistent presence in a child’s healthcare journey. As a registered nurse, she loved hands-on care and connection with patients, but she wanted to take on a more active role in diagnosis, treatment planning, and long-term care. Becoming a Pediatric Nurse Practitioner allowed her  to deepen her clinical knowledge while continuing to do what she loves: building trust with children and their families and helping them thrive.

Linda’s favorite part of working with children is the pureness of their hearts. Whether it’s pure happiness, pure silliness, pure mischief, or even pure fear or sadness, everything they feel is so genuine and unfiltered. That honesty is both humbling and inspiring. It reminds me daily of the importance of meeting them where they are, with compassion, patience, and joy. Working with Pediatric Sleep Specialists allows her to make a meaningful impact on a foundational aspect of children’s health—sleep. Linda loves being part of a team that helps families understand and manage sleep challenges, which often affect not only the child’s well-being but the entire household. It’s incredibly rewarding to see how improving sleep can transform a child’s mood, behavior, academic performance, and overall development.